* Problem with apache proxying between domains
@ 2005-02-14 21:15 Andrew Athan
2005-02-14 22:39 ` Nivedita Singhvi
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Athan @ 2005-02-14 21:15 UTC (permalink / raw)
To: xen-devel
I am experiencing some strangeness when using apache to proxy between
dom0 and a subdomain. The problem strangely shows up only when using
the QuickTime browser plugin inside IE6 to fetch a 9Meg movie which is
served via a PHP page in the subdomain.
If I fetch the If I change the URLs to fetch via the proxy in dom0, the
quicktime browser plugin hangs. The sniff headers below show that the
TCP window goes to 0, an indication that the plugin is not reading from
the socket.
I don't really know what to make of it. Perhaps the networking setup is
dropping packets and/or otherwise corrupting the stream, causing the
quicktime browser plugin to stop reading bytes from the socket?
The attached network sniff header lines from Ethereal show the
communication between 216.254.100.240 (browser) and 216.254.100.205
(dom0) which proxies to 216.254.100.181 (dom1). You will see that we go
to a ZeroWindow condition with about 3 Megs transferred out of the dom0
proxy. At the tail end -- the TCP connection is then kept alive, but
the QuickTime plugin never becomes "enabled" and can't play the movie.
Fetching the same URL via CURL on the Windows host, dom0 host, or a
separate physical linux host works fine. I also created a separate
Apache instance on a physically separate linux host, with the exact same
Rewrite rules. Fetching the movie through this proxy works fine in both
the QuickTime plugin AND CURL. I did this to eliminate the possibility
of some basic incompatibility between mod_proxy/mod_rewrite and
quicktime movies fetched by the quicktime browser plugin.
I have played with the ProxyIOBufferSize and ProxyBufferSize parameters
in the apache isntance in dom0, and have also tried various combinations
of bvt weights, warpback, etc.
Should I try to capture a sniff of xen-br0 during this interchage? Will
that help? WHen I tried this I think I only got partial data, perhaps
because of the xen domain scheduling causing missed packets.
No. Time Source Destination Protocol
Info
62 4.649725 216.254.100.240 216.254.100.205 TCP
3889 > http [SYN] Seq=0 Ack=0 Win=64512 Len=0 MSS=1260
63 4.650013 216.254.100.205 216.254.100.240 TCP
http > 3889 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
64 4.650064 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=1 Ack=1 Win=64512 Len=0
68 4.650744 216.254.100.240 216.254.100.205 HTTP
GET /tiki-download_file.php?fileId=1 HTTP/1.1
69 4.650961 216.254.100.205 216.254.100.240 TCP
http > 3889 [ACK] Seq=1 Ack=318 Win=6432 Len=0
73 4.774515 216.254.100.205 216.254.100.240 HTTP
HTTP/1.1 200 OK[Unreassembled Packet]
74 4.774607 216.254.100.205 216.254.100.240 HTTP
Continuation
75 4.774664 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=2521 Win=64512 Len=0
76 4.775122 216.254.100.205 216.254.100.240 HTTP
Continuation
77 4.775191 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=3781 Win=64512 Len=0
78 4.775245 216.254.100.205 216.254.100.240 HTTP
Continuation
79 4.775742 216.254.100.205 216.254.100.240 HTTP
Continuation
80 4.775772 216.254.100.205 216.254.100.240 HTTP
Continuation
81 4.775794 216.254.100.205 216.254.100.240 HTTP
Continuation
82 4.775850 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=8821 Win=64512 Len=0
83 4.776754 216.254.100.205 216.254.100.240 HTTP
Continuation
84 4.776821 216.254.100.205 216.254.100.240 HTTP
Continuation
85 4.776842 216.254.100.205 216.254.100.240 HTTP
Continuation
86 4.776863 216.254.100.205 216.254.100.240 HTTP
Continuation
87 4.776885 216.254.100.205 216.254.100.240 HTTP
Continuation
88 4.777030 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=15121 Win=64512 Len=0
89 4.777948 216.254.100.205 216.254.100.240 HTTP
Continuation
90 4.778014 216.254.100.205 216.254.100.240 HTTP
Continuation
91 4.778037 216.254.100.205 216.254.100.240 HTTP
Continuation
92 4.778060 216.254.100.205 216.254.100.240 HTTP
Continuation
93 4.778081 216.254.100.205 216.254.100.240 HTTP
Continuation
94 4.778150 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=21421 Win=61972 Len=0
95 4.778210 216.254.100.205 216.254.100.240 HTTP
Continuation
96 4.779062 216.254.100.205 216.254.100.240 HTTP
Continuation
97 4.779114 216.254.100.205 216.254.100.240 HTTP
Continuation
98 4.779137 216.254.100.205 216.254.100.240 HTTP
Continuation
99 4.779158 216.254.100.205 216.254.100.240 HTTP
Continuation
100 4.779180 216.254.100.205 216.254.100.240 HTTP
Continuation
101 4.779224 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=28981 Win=54412 Len=0
102 4.779280 216.254.100.205 216.254.100.240 HTTP
Continuation
103 4.779720 216.254.100.205 216.254.100.240 HTTP
Continuation
104 4.779760 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=31501 Win=51892 Len=0
105 4.779804 216.254.100.205 216.254.100.240 HTTP
Continuation
106 4.779828 216.254.100.205 216.254.100.240 HTTP
Continuation
107 4.779848 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=32836 Win=50557 Len=0
108 4.785314 216.254.100.205 216.254.100.240 HTTP
Continuation
109 4.785359 216.254.100.205 216.254.100.240 HTTP
Continuation
110 4.785383 216.254.100.205 216.254.100.240 HTTP
Continuation
111 4.785405 216.254.100.205 216.254.100.240 HTTP
Continuation
112 4.785426 216.254.100.205 216.254.100.240 HTTP
Continuation
113 4.785482 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=39136 Win=44257 Len=0
114 4.785564 216.254.100.205 216.254.100.240 HTTP
Continuation
115 4.785589 216.254.100.205 216.254.100.240 HTTP
Continuation
116 4.785604 216.254.100.205 216.254.100.240 HTTP
Continuation
117 4.785632 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=42200 Win=41193 Len=0
118 4.786417 216.254.100.205 216.254.100.240 HTTP
Continuation
119 4.786460 216.254.100.205 216.254.100.240 HTTP
Continuation
120 4.786484 216.254.100.205 216.254.100.240 HTTP
Continuation
121 4.786507 216.254.100.205 216.254.100.240 HTTP
Continuation
122 4.786531 216.254.100.205 216.254.100.240 HTTP
Continuation
123 4.786569 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=48500 Win=34893 Len=0
124 4.786621 216.254.100.205 216.254.100.240 HTTP
Continuation
125 4.786643 216.254.100.205 216.254.100.240 HTTP
Continuation
126 4.786668 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=50304 Win=33089 Len=0
127 4.786790 216.254.100.205 216.254.100.240 HTTP
Continuation
128 4.786813 216.254.100.205 216.254.100.240 HTTP
Continuation
129 4.786838 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=52824 Win=30569 Len=0
130 4.786876 216.254.100.205 216.254.100.240 HTTP
Continuation
131 4.787473 216.254.100.205 216.254.100.240 HTTP
Continuation
132 4.787513 216.254.100.205 216.254.100.240 HTTP
Continuation
133 4.787537 216.254.100.205 216.254.100.240 HTTP
Continuation
134 4.787559 216.254.100.205 216.254.100.240 HTTP
Continuation
135 4.787580 216.254.100.205 216.254.100.240 HTTP
Continuation
136 4.787620 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=60384 Win=23009 Len=0
137 4.787674 216.254.100.205 216.254.100.240 HTTP
Continuation
138 4.787700 216.254.100.205 216.254.100.240 HTTP
Continuation
139 4.787726 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=62904 Win=20489 Len=0
140 4.787774 216.254.100.205 216.254.100.240 HTTP
Continuation
141 4.787903 216.254.100.205 216.254.100.240 HTTP
Continuation
142 4.787929 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=65252 Win=18141 Len=0
143 4.793555 216.254.100.205 216.254.100.240 HTTP
Continuation
144 4.793639 216.254.100.205 216.254.100.240 HTTP
Continuation
145 4.793665 216.254.100.205 216.254.100.240 HTTP
Continuation
146 4.793690 216.254.100.205 216.254.100.240 HTTP
Continuation
147 4.793712 216.254.100.205 216.254.100.240 HTTP
Continuation
148 4.793771 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=71552 Win=11841 Len=0
149 4.793854 216.254.100.205 216.254.100.240 HTTP
Continuation
150 4.793879 216.254.100.205 216.254.100.240 HTTP
Continuation
151 4.793895 216.254.100.205 216.254.100.240 HTTP
Continuation
152 4.793916 216.254.100.205 216.254.100.240 HTTP
Continuation
153 4.793942 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=75876 Win=7517 Len=0
154 4.793995 216.254.100.205 216.254.100.240 HTTP
Continuation
155 4.794468 216.254.100.205 216.254.100.240 HTTP
Continuation
156 4.794499 216.254.100.205 216.254.100.240 HTTP
Continuation
157 4.794520 216.254.100.205 216.254.100.240 HTTP
Continuation
158 4.794544 216.254.100.205 216.254.100.240 HTTP
Continuation
159 4.794580 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=82176 Win=1217 Len=0
160 4.824230 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 159#1] 3889 > http [ACK] Seq=318 Ack=82176 Win=64512 Len=0
161 4.825237 216.254.100.205 216.254.100.240 HTTP
Continuation
162 4.825320 216.254.100.205 216.254.100.240 HTTP
Continuation
163 4.825347 216.254.100.205 216.254.100.240 HTTP
Continuation
164 4.825369 216.254.100.205 216.254.100.240 HTTP
Continuation
165 4.825391 216.254.100.205 216.254.100.240 HTTP
Continuation
166 4.825435 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=88476 Win=58212 Len=0
167 4.825497 216.254.100.205 216.254.100.240 HTTP
Continuation
168 4.825521 216.254.100.205 216.254.100.240 HTTP
Continuation
169 4.825550 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=90996 Win=55692 Len=0
170 4.825598 216.254.100.205 216.254.100.240 HTTP
Continuation
171 4.825735 216.254.100.205 216.254.100.240 HTTP
Continuation
172 4.825760 216.254.100.205 216.254.100.240 HTTP
Continuation
173 4.825786 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=94776 Win=51912 Len=0
174 4.826242 216.254.100.205 216.254.100.240 HTTP
Continuation
175 4.826277 216.254.100.205 216.254.100.240 HTTP
Continuation
176 4.826306 216.254.100.205 216.254.100.240 HTTP
Continuation
177 4.826329 216.254.100.205 216.254.100.240 HTTP
Continuation
178 4.826356 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=99816 Win=46872 Len=0
179 4.826414 216.254.100.205 216.254.100.240 HTTP
Continuation
180 4.826438 216.254.100.205 216.254.100.240 HTTP
Continuation
181 4.826464 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=102336 Win=44352 Len=0
182 4.826509 216.254.100.205 216.254.100.240 HTTP
Continuation
183 4.826701 216.254.100.205 216.254.100.240 HTTP
Continuation
184 4.826728 216.254.100.205 216.254.100.240 HTTP
Continuation
185 4.826758 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=106116 Win=40572 Len=0
186 4.826798 216.254.100.205 216.254.100.240 HTTP
Continuation
187 4.827226 216.254.100.205 216.254.100.240 HTTP
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188 4.827252 216.254.100.205 216.254.100.240 HTTP
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189 4.827282 216.254.100.205 216.254.100.240 HTTP
Continuation
190 4.827304 216.254.100.205 216.254.100.240 HTTP
Continuation
191 4.827330 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=112416 Win=34272 Len=0
192 4.827375 216.254.100.205 216.254.100.240 HTTP
Continuation
193 4.827670 216.254.100.205 216.254.100.240 HTTP
Continuation
194 4.827698 216.254.100.205 216.254.100.240 HTTP
Continuation
195 4.827721 216.254.100.205 216.254.100.240 HTTP
Continuation
196 4.827746 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=117456 Win=29232 Len=0
197 4.827787 216.254.100.205 216.254.100.240 HTTP
Continuation
198 4.828205 216.254.100.205 216.254.100.240 HTTP
Continuation
199 4.828234 216.254.100.205 216.254.100.240 HTTP
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200 4.828266 216.254.100.205 216.254.100.240 HTTP
Continuation
201 4.828288 216.254.100.205 216.254.100.240 HTTP
Continuation
202 4.828319 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=123756 Win=22932 Len=0
203 4.828366 216.254.100.205 216.254.100.240 HTTP
Continuation
204 4.828737 216.254.100.205 216.254.100.240 HTTP
Continuation
205 4.828763 216.254.100.205 216.254.100.240 HTTP
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206 4.828784 216.254.100.205 216.254.100.240 HTTP
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207 4.828805 216.254.100.205 216.254.100.240 HTTP
Continuation
208 4.828827 216.254.100.205 216.254.100.240 HTTP
Continuation
209 4.828846 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=130084 Win=16604 Len=0
210 4.831221 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 209#1] 3889 > http [ACK] Seq=318 Ack=130084 Win=20364 Len=0
211 4.832343 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 209#2] 3889 > http [ACK] Seq=318 Ack=130084 Win=64512 Len=0
212 4.833477 216.254.100.205 216.254.100.240 HTTP
Continuation
213 4.833549 216.254.100.205 216.254.100.240 HTTP
Continuation
214 4.833573 216.254.100.205 216.254.100.240 HTTP
Continuation
215 4.833597 216.254.100.205 216.254.100.240 HTTP
Continuation
216 4.833641 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=135124 Win=59472 Len=0
217 4.833700 216.254.100.205 216.254.100.240 HTTP
Continuation
218 4.833726 216.254.100.205 216.254.100.240 HTTP
Continuation
219 4.833750 216.254.100.205 216.254.100.240 HTTP
Continuation
220 4.833772 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=138188 Win=56408 Len=0
221 4.833820 216.254.100.205 216.254.100.240 HTTP
Continuation
222 4.833864 216.254.100.205 216.254.100.240 HTTP
Continuation
223 4.833890 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=140708 Win=53888 Len=0
224 4.834354 216.254.100.205 216.254.100.240 HTTP
Continuation
225 4.834384 216.254.100.205 216.254.100.240 HTTP
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226 4.834407 216.254.100.205 216.254.100.240 HTTP
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227 4.834431 216.254.100.205 216.254.100.240 HTTP
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228 4.834452 216.254.100.205 216.254.100.240 HTTP
Continuation
229 4.834478 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=146292 Win=48304 Len=0
230 4.834525 216.254.100.205 216.254.100.240 HTTP
Continuation
231 4.834884 216.254.100.205 216.254.100.240 HTTP
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232 4.834911 216.254.100.205 216.254.100.240 HTTP
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233 4.834935 216.254.100.205 216.254.100.240 HTTP
Continuation
234 4.834958 216.254.100.205 216.254.100.240 HTTP
Continuation
235 4.834986 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=152592 Win=42004 Len=0
236 4.835027 216.254.100.205 216.254.100.240 HTTP
Continuation
237 4.835053 216.254.100.205 216.254.100.240 HTTP
Continuation
238 4.835077 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=154396 Win=40200 Len=0
239 4.835362 216.254.100.205 216.254.100.240 HTTP
Continuation
240 4.835391 216.254.100.205 216.254.100.240 HTTP
Continuation
241 4.835415 216.254.100.205 216.254.100.240 HTTP
Continuation
242 4.835445 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=158176 Win=36420 Len=0
243 4.835486 216.254.100.205 216.254.100.240 HTTP
Continuation
244 4.835996 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=159436 Win=38920 Len=0
245 4.836053 216.254.100.205 216.254.100.240 HTTP
Continuation
246 4.836082 216.254.100.205 216.254.100.240 HTTP
Continuation
247 4.836104 216.254.100.205 216.254.100.240 HTTP
Continuation
248 4.836125 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=162500 Win=35856 Len=0
249 4.837229 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 248#1] 3889 > http [ACK] Seq=318 Ack=162500 Win=61448 Len=0
250 4.838720 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 248#2] 3889 > http [ACK] Seq=318 Ack=162500 Win=64512 Len=0
251 4.838813 216.254.100.205 216.254.100.240 HTTP
Continuation
252 4.838877 216.254.100.205 216.254.100.240 HTTP
Continuation
253 4.838909 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=165020 Win=64512 Len=0
254 4.838963 216.254.100.205 216.254.100.240 HTTP
Continuation
255 4.838992 216.254.100.205 216.254.100.240 HTTP
Continuation
256 4.839031 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=167540 Win=61992 Len=0
257 4.839070 216.254.100.205 216.254.100.240 HTTP
Continuation
258 4.839417 216.254.100.205 216.254.100.240 HTTP
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259 4.839443 216.254.100.205 216.254.100.240 HTTP
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260 4.839460 216.254.100.205 216.254.100.240 HTTP
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261 4.839482 216.254.100.205 216.254.100.240 HTTP
Continuation
262 4.839508 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=173124 Win=56408 Len=0
263 4.839551 216.254.100.205 216.254.100.240 HTTP
Continuation
264 4.839855 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=174384 Win=64512 Len=0
265 4.839898 216.254.100.205 216.254.100.240 HTTP
Continuation
266 4.839923 216.254.100.205 216.254.100.240 HTTP
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267 4.839946 216.254.100.205 216.254.100.240 HTTP
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268 4.839968 216.254.100.205 216.254.100.240 HTTP
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269 4.840018 216.254.100.205 216.254.100.240 HTTP
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270 4.840057 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=179968 Win=58928 Len=0
271 4.840096 216.254.100.205 216.254.100.240 HTTP
Continuation
272 4.840328 216.254.100.205 216.254.100.240 HTTP
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273 4.840354 216.254.100.205 216.254.100.240 HTTP
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274 4.840380 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=183748 Win=55148 Len=0
275 4.840421 216.254.100.205 216.254.100.240 HTTP
Continuation
276 4.840806 216.254.100.205 216.254.100.240 HTTP
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277 4.840835 216.254.100.205 216.254.100.240 HTTP
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278 4.840851 216.254.100.205 216.254.100.240 HTTP
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279 4.840875 216.254.100.205 216.254.100.240 HTTP
Continuation
280 4.840904 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=189332 Win=49564 Len=0
281 4.840949 216.254.100.205 216.254.100.240 HTTP
Continuation
282 4.841158 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=190592 Win=64512 Len=0
283 4.841205 216.254.100.205 216.254.100.240 HTTP
Continuation
284 4.841232 216.254.100.205 216.254.100.240 HTTP
Continuation
285 4.841259 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=193112 Win=61992 Len=0
286 4.841310 216.254.100.205 216.254.100.240 HTTP
Continuation
287 4.841334 216.254.100.205 216.254.100.240 HTTP
Continuation
288 4.841353 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=194916 Win=60188 Len=0
289 4.842655 216.254.100.240 216.254.100.205 TCP
[TCP Dup ACK 288#1] 3889 > http [ACK] Seq=318 Ack=194916 Win=63948 Len=0
290 4.845001 216.254.100.205 216.254.100.240 HTTP
Continuation
291 4.845084 216.254.100.205 216.254.100.240 HTTP
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292 4.845108 216.254.100.205 216.254.100.240 HTTP
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293 4.845134 216.254.100.205 216.254.100.240 HTTP
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294 4.845208 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=199956 Win=64512 Len=0
295 4.845302 216.254.100.205 216.254.100.240 HTTP
Continuation
296 4.845339 216.254.100.205 216.254.100.240 HTTP
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297 4.845361 216.254.100.205 216.254.100.240 HTTP
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298 4.845377 216.254.100.205 216.254.100.240 HTTP
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299 4.845410 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=204280 Win=63948 Len=0
300 4.845454 216.254.100.205 216.254.100.240 HTTP
Continuation
301 4.845478 216.254.100.205 216.254.100.240 HTTP
Continuation
302 4.845504 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=206800 Win=61428 Len=0
303 4.845547 216.254.100.205 216.254.100.240 HTTP
Continuation
304 4.845826 216.254.100.205 216.254.100.240 HTTP
Continuation
305 4.845855 216.254.100.205 216.254.100.240 HTTP
Continuation
306 4.845876 216.254.100.205 216.254.100.240 HTTP
Continuation
307 4.845899 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=211124 Win=57104 Len=0
308 4.845943 216.254.100.205 216.254.100.240 HTTP
Continuation
309 4.846371 216.254.100.205 216.254.100.240 HTTP
Continuation
310 4.846402 216.254.100.205 216.254.100.240 HTTP
Continuation
311 4.846424 216.254.100.205 216.254.100.240 HTTP
Continuation
312 4.846445 216.254.100.205 216.254.100.240 HTTP
Continuation
313 4.846479 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=217424 Win=50804 Len=0
314 4.846534 216.254.100.205 216.254.100.240 HTTP
Continuation
315 4.846561 216.254.100.205 216.254.100.240 HTTP
Continuation
316 4.846581 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=219228 Win=49000 Len=0
317 4.846627 216.254.100.205 216.254.100.240 HTTP
Continuation
318 4.846836 216.254.100.205 216.254.100.240 HTTP
Continuation
319 4.846863 216.254.100.205 216.254.100.240 HTTP
Continuation
320 4.846890 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=223008 Win=45220 Len=0
321 4.846930 216.254.100.205 216.254.100.240 HTTP
Continuation
322 4.847559 216.254.100.205 216.254.100.240 HTTP
Continuation
323 4.847598 216.254.100.205 216.254.100.240 HTTP
Continuation
324 4.847619 216.254.100.205 216.254.100.240 HTTP
Continuation
325 4.847651 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=227332 Win=40896 Len=0
326 4.850740 216.254.100.205 216.254.100.240 HTTP
Continuation
327 4.850820 216.254.100.205 216.254.100.240 HTTP
Continuation
328 4.850845 216.254.100.205 216.254.100.240 HTTP
Continuation
329 4.850869 216.254.100.205 216.254.100.240 HTTP
Continuation
330 4.850891 216.254.100.205 216.254.100.240 HTTP
Continuation
331 4.850959 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=233632 Win=58212 Len=0
332 4.851037 216.254.100.205 216.254.100.240 HTTP
Continuation
333 4.851064 216.254.100.205 216.254.100.240 HTTP
Continuation
334 4.851080 216.254.100.205 216.254.100.240 HTTP
Continuation
335 4.851102 216.254.100.205 216.254.100.240 HTTP
Continuation
336 4.851152 216.254.100.205 216.254.100.240 HTTP
Continuation
337 4.851189 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=239216 Win=52628 Len=0
338 4.851228 216.254.100.205 216.254.100.240 HTTP
Continuation
339 4.851599 216.254.100.205 216.254.100.240 HTTP
Continuation
340 4.851625 216.254.100.205 216.254.100.240 HTTP
Continuation
341 4.851648 216.254.100.205 216.254.100.240 HTTP
Continuation
342 4.851665 216.254.100.205 216.254.100.240 HTTP
Continuation
343 4.851693 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=244800 Win=47044 Len=0
344 4.851734 216.254.100.205 216.254.100.240 HTTP
Continuation
345 4.852133 216.254.100.205 216.254.100.240 HTTP
Continuation
346 4.852163 216.254.100.205 216.254.100.240 HTTP
Continuation
347 4.852186 216.254.100.205 216.254.100.240 HTTP
Continuation
348 4.852208 216.254.100.205 216.254.100.240 HTTP
Continuation
349 4.852237 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=251100 Win=40744 Len=0
350 4.852282 216.254.100.205 216.254.100.240 HTTP
Continuation
351 4.852301 216.254.100.205 216.254.100.240 HTTP
Continuation
352 4.852328 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=252904 Win=38940 Len=0
353 4.852383 216.254.100.205 216.254.100.240 HTTP
Continuation
354 4.852494 216.254.100.205 216.254.100.240 HTTP
Continuation
355 4.852521 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=255424 Win=36420 Len=0
356 4.853043 216.254.100.205 216.254.100.240 HTTP
Continuation
357 4.853071 216.254.100.205 216.254.100.240 HTTP
Continuation
358 4.853094 216.254.100.205 216.254.100.240 HTTP
Continuation
359 4.853117 216.254.100.205 216.254.100.240 HTTP
Continuation
360 4.853138 216.254.100.205 216.254.100.240 HTTP
Continuation
361 4.853166 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=261724 Win=30120 Len=0
362 4.853209 216.254.100.205 216.254.100.240 HTTP
Continuation
363 4.853564 216.254.100.205 216.254.100.240 HTTP
Continuation
364 4.853592 216.254.100.205 216.254.100.240 HTTP
Continuation
365 4.853614 216.254.100.205 216.254.100.240 HTTP
Continuation
366 4.853636 216.254.100.205 216.254.100.240 HTTP
Continuation
367 4.853665 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=267852 Win=23992 Len=0
368 4.856461 216.254.100.205 216.254.100.240 HTTP
Continuation
369 4.856572 216.254.100.205 216.254.100.240 HTTP
Continuation
370 4.856599 216.254.100.205 216.254.100.240 HTTP
Continuation
371 4.856625 216.254.100.205 216.254.100.240 HTTP
Continuation
372 4.856649 216.254.100.205 216.254.100.240 HTTP
Continuation
373 4.856714 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=274152 Win=17692 Len=0
374 4.856823 216.254.100.205 216.254.100.240 HTTP
Continuation
375 4.856852 216.254.100.205 216.254.100.240 HTTP
Continuation
376 4.856868 216.254.100.205 216.254.100.240 HTTP
Continuation
377 4.856891 216.254.100.205 216.254.100.240 HTTP
Continuation
378 4.856914 216.254.100.205 216.254.100.240 HTTP
Continuation
379 4.856943 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=279736 Win=12108 Len=0
380 4.856997 216.254.100.205 216.254.100.240 HTTP
Continuation
381 4.857306 216.254.100.205 216.254.100.240 HTTP
Continuation
382 4.857333 216.254.100.205 216.254.100.240 HTTP
Continuation
383 4.857361 216.254.100.205 216.254.100.240 HTTP
Continuation
384 4.857378 216.254.100.205 216.254.100.240 HTTP
Continuation
385 4.857406 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=285320 Win=6524 Len=0
386 4.857450 216.254.100.205 216.254.100.240 HTTP
Continuation
387 4.857843 216.254.100.205 216.254.100.240 HTTP
Continuation
388 4.857872 216.254.100.205 216.254.100.240 HTTP
Continuation
389 4.857894 216.254.100.205 216.254.100.240 HTTP
Continuation
390 4.857915 216.254.100.205 216.254.100.240 HTTP
Continuation
391 4.857946 216.254.100.240 216.254.100.205 TCP
3889 > http [ACK] Seq=318 Ack=291620 Win=224 Len=0
392 5.060921 216.254.100.205 216.254.100.240 HTTP
Continuation
393 5.222632 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] 3889 > http [ACK] Seq=318 Ack=291844 Win=0 Len=0
400 5.440282 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
401 5.440390 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
404 5.880280 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
405 5.880392 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
420 6.760267 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
421 6.760368 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
436 8.520475 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
437 8.520584 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
479 12.040682 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
480 12.040778 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
553 19.063159 216.254.100.205 216.254.100.240 TCP
[TCP Keep-Alive] http > 3889 [ACK] Seq=291843 Ack=318 Win=6432 Len=0
554 19.063262 216.254.100.240 216.254.100.205 TCP
[TCP ZeroWindow] [TCP Keep-Alive ACK] 3889 > http [ACK] Seq=318
Ack=291844 Win=0 Len=0
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Problem with apache proxying between domains
2005-02-14 21:15 Problem with apache proxying between domains Andrew Athan
@ 2005-02-14 22:39 ` Nivedita Singhvi
2005-02-14 23:28 ` Andrew Athan
0 siblings, 1 reply; 4+ messages in thread
From: Nivedita Singhvi @ 2005-02-14 22:39 UTC (permalink / raw)
To: Andrew Athan; +Cc: xen-devel
Andrew Athan wrote:
> The attached network sniff header lines from Ethereal show the
> communication between 216.254.100.240 (browser) and 216.254.100.205
> (dom0) which proxies to 216.254.100.181 (dom1). You will see that we go
> to a ZeroWindow condition with about 3 Megs transferred out of the dom0
> proxy. At the tail end -- the TCP connection is then kept alive, but
> the QuickTime plugin never becomes "enabled" and can't play the movie.
Can you attach to the process via strace or something and check
what it's doing? Is it getting scheduled or waiting on IO?
Since it keepalives successfully, I'm assuming your interface
hasn't gone down. Also, check for a memory failure - could be
a mem leak.
> Fetching the same URL via CURL on the Windows host, dom0 host, or a
> separate physical linux host works fine. I also created a separate
> Apache instance on a physically separate linux host, with the exact same
> Rewrite rules. Fetching the movie through this proxy works fine in both
> the QuickTime plugin AND CURL. I did this to eliminate the possibility
> of some basic incompatibility between mod_proxy/mod_rewrite and
> quicktime movies fetched by the quicktime browser plugin.
It does look like reading process stops reading. Did you
alter the default socket buffer sizes, at all, btw?
> I have played with the ProxyIOBufferSize and ProxyBufferSize parameters
> in the apache isntance in dom0, and have also tried various combinations
> of bvt weights, warpback, etc.
>
> Should I try to capture a sniff of xen-br0 during this interchage? Will
> that help? WHen I tried this I think I only got partial data, perhaps
> because of the xen domain scheduling causing missed packets.
You do seem to be missing packets in your trace as well.
netstat -tan
netstat -s
ifconfig -a
/proc/slabinfo
vmstat
would be useful on both dom0 and of course, dom1..
thanks,
Nivedita
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Problem with apache proxying between domains
2005-02-14 22:39 ` Nivedita Singhvi
@ 2005-02-14 23:28 ` Andrew Athan
2005-02-15 0:41 ` Nivedita Singhvi
0 siblings, 1 reply; 4+ messages in thread
From: Andrew Athan @ 2005-02-14 23:28 UTC (permalink / raw)
To: Nivedita Singhvi; +Cc: xen-devel
What's the equivalent of strace on Windows XP?
:-)
I can strace the two apache processes on the Linux hosts, but not sure I
can get useful information about the quicktime plugin in the browser.
By the way, dom1 is using swap which is an LVM volume in dom0. Could
there be some kind of deadlock in which dom0's apache is blocking on a
network read which dom1 cannot service because it needs swap, which dom0
cannot supply via LVM because the dom0 inter-domain stuff is "stuck"
trying to service the apache inter-domain network request ??
I needed to make progress, so I have punted on inter-domain apache
proxying for now. However, I can set up a test config easily enough if
that is of interest to the group. The missing packets are somewhat
worrisome to me, since I would have thought that inter-domain
communication was lossless.
A.
Nivedita Singhvi wrote:
> Andrew Athan wrote:
>
>> The attached network sniff header lines from Ethereal show the
>> communication between 216.254.100.240 (browser) and 216.254.100.205
>> (dom0) which proxies to 216.254.100.181 (dom1). You will see that we go
>> to a ZeroWindow condition with about 3 Megs transferred out of the dom0
>> proxy. At the tail end -- the TCP connection is then kept alive, but
>> the QuickTime plugin never becomes "enabled" and can't play the movie.
>
>
> Can you attach to the process via strace or something and check
> what it's doing? Is it getting scheduled or waiting on IO?
> Since it keepalives successfully, I'm assuming your interface
> hasn't gone down. Also, check for a memory failure - could be
> a mem leak.
>
>> Fetching the same URL via CURL on the Windows host, dom0 host, or a
>> separate physical linux host works fine. I also created a separate
>> Apache instance on a physically separate linux host, with the exact same
>> Rewrite rules. Fetching the movie through this proxy works fine in both
>> the QuickTime plugin AND CURL. I did this to eliminate the possibility
>> of some basic incompatibility between mod_proxy/mod_rewrite and
>> quicktime movies fetched by the quicktime browser plugin.
>
>
> It does look like reading process stops reading. Did you
> alter the default socket buffer sizes, at all, btw?
>
>> I have played with the ProxyIOBufferSize and ProxyBufferSize parameters
>> in the apache isntance in dom0, and have also tried various combinations
>> of bvt weights, warpback, etc.
>>
>> Should I try to capture a sniff of xen-br0 during this interchage? Will
>> that help? WHen I tried this I think I only got partial data, perhaps
>> because of the xen domain scheduling causing missed packets.
>
>
> You do seem to be missing packets in your trace as well.
>
> netstat -tan
> netstat -s
> ifconfig -a
> /proc/slabinfo
> vmstat
>
> would be useful on both dom0 and of course, dom1..
>
> thanks,
> Nivedita
>
>
> -------------------------------------------------------
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> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
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> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Problem with apache proxying between domains
2005-02-14 23:28 ` Andrew Athan
@ 2005-02-15 0:41 ` Nivedita Singhvi
0 siblings, 0 replies; 4+ messages in thread
From: Nivedita Singhvi @ 2005-02-15 0:41 UTC (permalink / raw)
To: Andrew Athan; +Cc: xen-devel
Andrew Athan wrote:
> What's the equivalent of strace on Windows XP?
Ah, right, you did say 240 was a windows box.
I don't know that your browser read any data at all.
It starts off with a 64K window - and if you notice
in the log, it just ramps down till it goes to zero.
Doesn't look like any data got pushed to the application.
205 (dom0) sure pushed a bunch of data out, so not sure
that the problem is between dom0 <-> dom1. At least,
no evidence yet of that.
If it's not too much trouble, could you also grab
a trace of a successful transfer?
> I can strace the two apache processes on the Linux hosts, but not sure I
> can get useful information about the quicktime plugin in the browser.
Might help to collect stats off dom1, though.
> By the way, dom1 is using swap which is an LVM volume in dom0. Could
> there be some kind of deadlock in which dom0's apache is blocking on a
> network read which dom1 cannot service because it needs swap, which dom0
> cannot supply via LVM because the dom0 inter-domain stuff is "stuck"
> trying to service the apache inter-domain network request ??
See above - your trace is showing the exchange between dom0 and
the browser box, correct? It has a problem on the receiver end
(windows browser not reading) - double check that..
> I needed to make progress, so I have punted on inter-domain apache
> proxying for now. However, I can set up a test config easily enough if
> that is of interest to the group. The missing packets are somewhat
> worrisome to me, since I would have thought that inter-domain
> communication was lossless.
Could be ethereal that's missing the packets, not
necessarily the interfaces that dropped them, stats would tell..
thanks,
Nivedita
-------------------------------------------------------
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-02-15 0:41 UTC | newest]
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2005-02-14 21:15 Problem with apache proxying between domains Andrew Athan
2005-02-14 22:39 ` Nivedita Singhvi
2005-02-14 23:28 ` Andrew Athan
2005-02-15 0:41 ` Nivedita Singhvi
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