* Very high system load writing data to SCSI DVD-RAM
@ 2001-02-05 18:32 Oliver Feiler
2001-02-05 18:46 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: Oliver Feiler @ 2001-02-05 18:32 UTC (permalink / raw)
To: linux-kernel
Hello,
I have the following problem with a DVD-RAM drive. The drive is a
Panasonic LF-D101 connected to a Tekram DC395U SCSI controller. Kernel is
2.2.18 with the patch for the Tekram controller
(http://www.garloff.de/kurt/linux/dc395/).
When I write huge amounts of data to a DVD-RAM the system load is
getting very high, like 10 or even above and the system temporarily freezes
for a short time every minute or so while writing data to the drive. The DVD
drive writes data with 1.35 MB/sec on the discs so there is not really much
data going over the SCSI controller. Reading data from DVD-RAMs is done with
2.7 MB/s (2x) by the drive and does not cause any problems at all.
This problem also existed with previous kernels (2.2.16/17) and with
another SCSI controller I had before the Tekram. Adaptec 2904CD using the
aic7xxx driver.
There is a 4x Teac burner connected to the SCSI controller as well.
Burning CDs does not raise the system load or cause any other problems.
Bye,
Oliver
--
Oliver Feiler kiza@gmx.net
http://www.lionking.org/~kiza/pgpkey PGP key ID: 0x561D4FD2
http://www.lionking.org/~kiza/
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* Re: Very high system load writing data to SCSI DVD-RAM
2001-02-05 18:32 Very high system load writing data to SCSI DVD-RAM Oliver Feiler
@ 2001-02-05 18:46 ` Jens Axboe
2001-02-05 19:42 ` Oliver Feiler
0 siblings, 1 reply; 3+ messages in thread
From: Jens Axboe @ 2001-02-05 18:46 UTC (permalink / raw)
To: Oliver Feiler; +Cc: linux-kernel
On Mon, Feb 05 2001, Oliver Feiler wrote:
> Hello,
>
> I have the following problem with a DVD-RAM drive. The drive is a
> Panasonic LF-D101 connected to a Tekram DC395U SCSI controller. Kernel is
> 2.2.18 with the patch for the Tekram controller
> (http://www.garloff.de/kurt/linux/dc395/).
>
> When I write huge amounts of data to a DVD-RAM the system load is
> getting very high, like 10 or even above and the system temporarily freezes
> for a short time every minute or so while writing data to the drive. The DVD
> drive writes data with 1.35 MB/sec on the discs so there is not really much
This is an old problem, and not related to the dvd-ram itself. If you
dirty lots of data and the target device is slow, kswapd/bdflush
will go crazy trying to free up memory. It should behave better on
2.4.1, where we impose a global limit on locked buffers. Try and run
a vmstat 1 while doing the copy, and send that along.
> data going over the SCSI controller. Reading data from DVD-RAMs is done with
> 2.7 MB/s (2x) by the drive and does not cause any problems at all.
Reading is much easier to control.
> There is a 4x Teac burner connected to the SCSI controller as well.
> Burning CDs does not raise the system load or cause any other problems.
Burning CDs is very different and does not put pressure on the mm.
--
Jens Axboe
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* Re: Very high system load writing data to SCSI DVD-RAM
2001-02-05 18:46 ` Jens Axboe
@ 2001-02-05 19:42 ` Oliver Feiler
0 siblings, 0 replies; 3+ messages in thread
From: Oliver Feiler @ 2001-02-05 19:42 UTC (permalink / raw)
To: Jens Axboe; +Cc: linux-kernel
[-- Attachment #1: Type: text/plain, Size: 850 bytes --]
Jens Axboe wrote:
>
> This is an old problem, and not related to the dvd-ram itself. If you
> dirty lots of data and the target device is slow, kswapd/bdflush
> will go crazy trying to free up memory. It should behave better on
> 2.4.1, where we impose a global limit on locked buffers. Try and run
> a vmstat 1 while doing the copy, and send that along.
Ok, here is it. Started vmstat right before I copied 150 MB to a disc
and let it run until moving the data was finished. The system froze once
during that for about 20 sec and the system load went to about 8.
Hmm, the system has 192 MB RAM if that may be of importance for the
output of vmstat.
Bye
Oliver
--
Oliver Feiler kiza@gmx.net
http://www.lionking.org/~kiza/pgpkey PGP key ID: 0x561D4FD2
http://www.lionking.org/~kiza/
[-- Attachment #2: vm --]
[-- Type: text/plain, Size: 13841 bytes --]
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 19060 30232 115008 12912 0 5 46 36 237 1109 4 3 93
0 0 0 19060 30232 115008 12912 0 0 0 0 160 464 1 1 98
0 0 0 19060 30224 115016 12912 0 0 2 0 104 175 1 0 99
1 0 0 19060 21340 119268 17480 60 0 1038 0 629 1000 0 12 88
2 0 0 19060 2372 128756 26960 0 0 1255 0 738 1221 0 17 83
2 0 0 19060 2428 122984 32728 0 0 1295 1 884 1438 4 32 64
0 2 0 19060 2932 114528 40696 0 0 1131 27 726 1136 1 26 73
1 0 0 19060 3112 110004 44896 0 0 1184 0 709 1136 1 13 86
0 1 0 19060 2124 103764 52188 0 0 1447 1000 951 1373 2 16 82
0 1 1 19060 2256 101168 54664 0 0 660 922 575 717 0 5 95
3 1 1 19060 3064 99776 55248 0 0 149 144 319 277 1 5 94
0 1 2 19060 3064 99776 55248 0 0 0 161 245 249 0 1 99
0 1 2 19060 3064 99776 55248 0 0 0 144 244 206 0 1 99
0 1 2 19060 3052 99776 55248 0 0 0 160 249 208 1 2 97
1 1 2 19060 3052 99776 55248 0 0 0 176 265 195 0 1 99
0 1 2 19060 3052 99776 55248 0 0 0 11 267 224 0 1 99
0 1 2 19060 3052 99776 55248 0 0 0 11 269 259 0 4 96
0 1 2 19060 3052 99776 55248 0 0 0 11 269 295 0 3 97
1 1 2 19060 3052 99776 55248 0 0 0 11 267 188 0 1 99
1 1 2 19060 3052 99776 55248 0 0 0 11 267 199 0 1 99
0 1 2 19060 3052 99776 55248 0 0 0 10 252 192 0 1 99
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 1 2 19060 3052 99776 55248 0 0 0 10 248 274 0 1 99
1 1 2 19060 3052 99776 55248 0 0 0 10 247 279 1 3 96
0 1 2 19060 3052 99776 55248 0 0 0 9 246 267 0 3 97
0 1 2 19060 3052 99776 55248 0 0 0 45 406 397 0 1 99
0 1 2 19060 3052 99776 55248 0 0 0 160 879 852 0 2 98
1 1 2 19060 3052 99776 55248 0 0 0 160 822 650 0 1 99
0 1 1 19060 2184 97624 58508 0 0 921 1753 1380 1287 0 13 87
0 1 2 19060 2784 92344 63256 0 0 1281 146 906 1397 0 8 92
0 1 2 19060 2784 92344 63256 0 0 0 9 245 290 5 1 94
0 1 2 19060 2784 92344 63256 0 0 0 10 245 260 0 1 99
1 1 2 19060 2784 92344 63256 0 0 0 9 244 190 0 1 99
1 1 2 19060 2784 92344 63256 0 0 0 10 245 206 0 1 99
0 1 2 19060 2784 92344 63256 0 0 0 9 247 208 0 1 99
0 1 2 19060 2784 92344 63256 0 0 0 11 267 247 0 1 99
1 2 2 19060 2724 92348 63260 0 0 2 12 269 234 1 1 98
0 2 2 19060 2724 92348 63260 0 0 0 11 285 290 0 1 99
0 2 2 19060 2724 92348 63260 0 0 0 26 339 534 1 2 97
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0 2 2 19060 2724 92348 63260 0 0 0 10 261 306 0 1 99
0 2 2 19060 2724 92348 63260 0 0 0 9 331 527 0 1 99
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
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1 2 2 19060 2724 92348 63260 0 0 0 160 822 805 0 1 99
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0 2 2 19060 2720 92352 63260 0 0 0 160 824 856 0 1 99
4 2 2 19060 36476 58924 63880 192 0 7076 14798 33013 39330 0 1 99
1 3 0 19060 30216 61764 66960 0 0 869 1 939 1001 0 9 91
2 1 0 19060 21084 66372 71816 64 0 1218 1559 759 1367 2 6 92
2 1 0 19060 10476 71592 77200 0 0 1349 208 901 1388 0 7 93
0 3 0 19060 2284 75488 81564 64 0 1172 140 906 1365 0 1 99
0 2 0 19056 2632 75364 81376 0 0 1203 1 896 1177 1 7 92
0 2 0 19056 2632 75364 81376 0 0 0 0 245 241 1 0 99
0 2 0 19056 2632 75364 81376 0 0 0 0 244 159 0 1 99
0 2 0 19056 2632 75364 81376 0 0 0 0 245 175 1 0 99
0 2 0 19016 2452 74888 81788 232 0 282 0 415 886 5 4 91
1 2 1 19016 3440 74468 81224 0 0 10 900 255 262 2 2 96
1 2 1 19016 3440 74468 81224 0 0 0 144 325 519 1 2 97
0 2 1 19016 3440 74468 81224 0 0 0 161 344 670 1 1 98
1 2 1 19016 3792 74468 81224 0 0 0 161 306 441 2 1 97
2 2 1 19016 3792 74468 81224 0 0 0 160 261 198 0 0 100
0 2 1 19016 3792 74468 81224 0 0 0 160 267 211 1 0 99
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 2 1 19016 3792 74468 81224 0 0 0 128 215 264 0 1 99
0 2 1 19016 3792 74468 81224 0 0 0 0 102 155 0 1 99
1 2 1 19016 2624 75040 81860 0 0 1547 272 1042 1573 1 7 92
0 2 1 19016 2768 74952 81836 0 0 1618 160 1068 1601 0 7 93
1 1 1 19016 2520 75128 81916 0 0 1438 176 1006 1580 2 19 79
1 1 1 19016 2272 75424 81876 0 0 1600 176 1070 1557 0 12 88
0 2 2 19016 3188 75116 81272 0 0 318 71 418 443 0 5 95
0 2 2 19016 3188 75116 81272 0 0 0 10 255 204 0 2 98
0 2 2 19016 3188 75116 81272 0 0 0 11 257 209 0 0 100
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0 2 2 19016 3188 75116 81272 0 0 0 10 251 273 0 0 100
0 2 2 19016 3188 75116 81272 0 0 0 11 260 193 0 1 99
0 2 2 19016 3188 75116 81272 0 0 0 10 260 214 0 2 98
0 2 2 19016 3184 75116 81272 0 0 0 10 253 220 0 0 100
0 2 2 19016 3184 75116 81272 0 0 0 116 261 247 0 3 97
1 2 2 19016 3184 75116 81272 0 0 0 152 254 212 0 1 99
1 2 2 19016 1112 76212 82248 0 0 559 1349 840 734 0 9 91
0 4 2 19016 27148 63316 69200 0 0 42 161 307 200 0 1 99
5 2 1 19016 41524 56180 61984 0 0 143 1572 2521 733 0 1 99
2 1 1 19016 29168 62364 68152 0 0 1543 192 1065 1805 1 6 93
0 3 2 19016 28684 62608 68396 0 0 61 11 303 371 1 0 99
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 3 2 19016 28684 62608 68396 0 0 0 10 261 219 0 1 99
0 3 2 19016 28684 62608 68396 0 0 0 8 213 214 0 1 99
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0 3 2 19016 28684 62608 68396 0 0 0 5 177 173 1 0 99
0 3 2 19016 28684 62608 68396 0 0 0 12 217 189 0 1 99
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0 3 2 19016 28684 62608 68396 0 0 0 9 244 217 1 0 99
0 3 2 19016 28684 62608 68396 0 0 0 10 245 251 1 0 99
1 3 2 19016 28680 62612 68396 0 0 0 19 281 226 1 0 99
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0 3 2 19016 28680 62612 68396 0 0 0 152 786 749 1 0 99
1 2 1 19016 22044 65932 71708 0 0 831 1089 1299 1648 0 14 86
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procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
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0 2 1 19012 79328 73880 6564 0 0 0 144 236 187 0 0 100
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1 1 1 19012 79340 73880 6620 0 0 14 224 291 366 0 1 99
0 1 1 19012 79340 73880 6620 0 0 0 144 243 252 0 0 100
0 1 1 19012 79340 73880 6620 0 0 0 73 178 192 0 0 100
0 1 1 19012 79340 73880 6620 0 0 0 187 268 188 0 0 100
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procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
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procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
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2001-02-05 18:32 Very high system load writing data to SCSI DVD-RAM Oliver Feiler
2001-02-05 18:46 ` Jens Axboe
2001-02-05 19:42 ` Oliver Feiler
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