* to many sockets ?
@ 2006-10-04 15:03 Markus Wenke
2006-10-04 16:33 ` Alan Cox
0 siblings, 1 reply; 9+ messages in thread
From: Markus Wenke @ 2006-10-04 15:03 UTC (permalink / raw)
To: linux-kernel
Hi,
I wrote a program which handles incomming sockets asynchron.
It can handle up to 140000 connections simultaneously while every
connection send some bytes in both directions continuously.
But if I want to connect more than the 140000 connection my application
has been killed by the oom-killer, but the System has enough memory.
If I use a patched Xen-Kernel (2.6.16.21-0.13-xen, only the kernel, no
xend) it can handle up to 200000 connections.
Is there a kernel param, or something else to tune the kernel, that it
can handle more Connections?
Or can I determine how many connections can my really System accept
before the oom-killer kills my app?
please send me an email, for getting the /var/log/messages
thanks in advance
Markus Wenke
here my System:
////////////////////////////////////////////////////////////////////////////
setrlimit: RLIMIT_NOFILE = 500000
////////////////////////////////////////////////////////////////////////////
~# uname -a
Linux test1 2.6.18-bigsmp #3 SMP Wed Oct 4 15:18:40 CEST 2006 i686
athlon i386 GNU/Linux
////////////////////////////////////////////////////////////////////////////
~# free:
total used free shared buffers cached
Mem: 3108372 193788 2914584 0 5520 107068
-/+ buffers/cache: 81200 3027172
Swap: 2104472 0 2104472
////////////////////////////////////////////////////////////////////////////
~ # cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 35
model name : Dual Core AMD Opteron(tm) Processor 170
stepping : 2
cpu MHz : 1000.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
lm 3dnowext 3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips : 2011.55
processor : 1
vendor_id : AuthenticAMD
cpu family : 15
model : 35
model name : Dual Core AMD Opteron(tm) Processor 170
stepping : 2
cpu MHz : 1000.000
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
lm 3dnowext 3dnow pni lahf_lm cmp_legacy ts fid vid ttp
bogomips : 2011.55
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: to many sockets ?
2006-10-04 15:03 to many sockets ? Markus Wenke
@ 2006-10-04 16:33 ` Alan Cox
2006-10-05 7:14 ` Markus Wenke
0 siblings, 1 reply; 9+ messages in thread
From: Alan Cox @ 2006-10-04 16:33 UTC (permalink / raw)
To: Markus Wenke; +Cc: linux-kernel
Ar Mer, 2006-10-04 am 17:03 +0200, ysgrifennodd Markus Wenke:
> Hi,
>
> I wrote a program which handles incomming sockets asynchron.
> It can handle up to 140000 connections simultaneously while every
> connection send some bytes in both directions continuously.
Armwavingly 64K x 2 per socket worst case for non tcp windowed buffering
128K per socket x 140000 connections
8750MB of RAM
plus other overhead
Assuming you kept the socket buffer limit to 64K by setting it or
disabling window scaling you'd want a about 10GB of RAM for the sockets,
buffering and resources. With tcp windows you'd need more.
If your data rates are always low, or the link is low latency you could
set the send/receive socket buffer for each connection via setsockopt
down to say 8K and come out needing perhaps 1GB or so instead.
You will also need a very fast network for that many connections just
for the cost of headers/ack frames.
Alan
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-04 16:33 ` Alan Cox
@ 2006-10-05 7:14 ` Markus Wenke
2006-10-05 7:58 ` Eric Dumazet
2006-10-05 21:30 ` Alan Cox
0 siblings, 2 replies; 9+ messages in thread
From: Markus Wenke @ 2006-10-05 7:14 UTC (permalink / raw)
To: Alan Cox; +Cc: linux-kernel
Alan Cox schrieb:
> Ar Mer, 2006-10-04 am 17:03 +0200, ysgrifennodd Markus Wenke:
>
>> Hi,
>>
>> I wrote a program which handles incomming sockets asynchron.
>> It can handle up to 140000 connections simultaneously while every
>> connection send some bytes in both directions continuously.
>>
>
> Armwavingly 64K x 2 per socket worst case for non tcp windowed buffering
>
> 128K per socket x 140000 connections
>
> 8750MB of RAM
>
> plus other overhead
>
> Assuming you kept the socket buffer limit to 64K by setting it or
> disabling window scaling you'd want a about 10GB of RAM for the sockets,
> buffering and resources. With tcp windows you'd need more.
The default values of my system are:
SO_SNDBUF = 16384
SO_RCVBUF = 87380
> If your data rates are always low, or the link is low latency you could
> set the send/receive socket buffer for each connection via setsockopt
> down to say 8K and come out needing perhaps 1GB or so instead.
>
I tried the same scenario with SO_SNDBUF = SO_RCVBUF = 8k, so that the
max memory is ca. 2G
and the oom-killer kills my application at the same time (at 140000
connections).
I can not see in the messages that the system is out of memory,
there is also no swap space used
You can download my /var/log/messages at
http://hemaho.mine.nu/~biber/messages
May you can give me a hint which line/value in the log shows me,
that the system is out of memory?
Thanks in advance
Markus Wenke
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-05 7:14 ` Markus Wenke
@ 2006-10-05 7:58 ` Eric Dumazet
2006-10-05 8:20 ` Markus Wenke
2006-10-05 21:30 ` Alan Cox
1 sibling, 1 reply; 9+ messages in thread
From: Eric Dumazet @ 2006-10-05 7:58 UTC (permalink / raw)
To: Markus Wenke; +Cc: Alan Cox, linux-kernel
On Thursday 05 October 2006 09:14, Markus Wenke wrote:
> I tried the same scenario with SO_SNDBUF = SO_RCVBUF = 8k, so that the
> max memory is ca. 2G
> and the oom-killer kills my application at the same time (at 140000
> connections).
>
> I can not see in the messages that the system is out of memory,
> there is also no swap space used
>
> You can download my /var/log/messages at
> http://hemaho.mine.nu/~biber/messages
>
> May you can give me a hint which line/value in the log shows me,
> that the system is out of memory?
I think you lack of LOWMEM, since you use a 32bits kernel.
Could you post here the result of these commands when your system is using
more than 100.000 connections (and before the OOM :) )
cat /proc/meminfo
cat /proc/slabinfo
cat /proc/net/sockstat
cat /proc/net/stat/rt_cache
cat /proc/buddyinfo
grep . /proc/sys/net/ipv4/*
grep . /proc/sys/net/ipv4/route/*
Eric
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-05 7:58 ` Eric Dumazet
@ 2006-10-05 8:20 ` Markus Wenke
2006-10-05 8:45 ` Eric Dumazet
0 siblings, 1 reply; 9+ messages in thread
From: Markus Wenke @ 2006-10-05 8:20 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Alan Cox, linux-kernel
Eric Dumazet schrieb:
> On Thursday 05 October 2006 09:14, Markus Wenke wrote:
>
>
>> I tried the same scenario with SO_SNDBUF = SO_RCVBUF = 8k, so that the
>> max memory is ca. 2G
>> and the oom-killer kills my application at the same time (at 140000
>> connections).
>>
>> I can not see in the messages that the system is out of memory,
>> there is also no swap space used
>>
>> You can download my /var/log/messages at
>> http://hemaho.mine.nu/~biber/messages
>>
>> May you can give me a hint which line/value in the log shows me,
>> that the system is out of memory?
>>
>
> I think you lack of LOWMEM, since you use a 32bits kernel.
>
> Could you post here the result of these commands when your system is using
> more than 100.000 connections (and before the OOM :) )
Hi,
here the results with 130001 connetions
>
> cat /proc/meminfo
MemTotal: 3108372 kB
MemFree: 2114404 kB
Buffers: 5112 kB
Cached: 97804 kB
SwapCached: 0 kB
Active: 140552 kB
Inactive: 38948 kB
HighTotal: 2228160 kB
HighFree: 2048108 kB
LowTotal: 880212 kB
LowFree: 66296 kB
SwapTotal: 2104472 kB
SwapFree: 2104472 kB
Dirty: 52 kB
Writeback: 0 kB
AnonPages: 76532 kB
Mapped: 9180 kB
Slab: 282716 kB
PageTables: 592 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3658656 kB
Committed_AS: 157968 kB
VmallocTotal: 110584 kB
VmallocUsed: 9244 kB
VmallocChunk: 100676 kB
> cat /proc/slabinfo
slabinfo - version: 2.1
# name <active_objs> <num_objs> <objsize> <objperslab>
<pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata
<active_slabs> <num_slabs> <sharedavail>
cifs_small_rq 45 45 448 9 1 : tunables 54 27
8 : slabdata 5 5 0
cifs_request 6 6 16512 1 8 : tunables 8 4
0 : slabdata 6 6 0
cifs_oplock_structs 0 0 32 113 1 : tunables 120
60 8 : slabdata 0 0 0
cifs_mpx_ids 4 59 64 59 1 : tunables 120 60
8 : slabdata 1 1 0
cifs_inode_cache 20 20 384 10 1 : tunables 54 27
8 : slabdata 2 2 0
fib6_nodes 5 113 32 113 1 : tunables 120 60
8 : slabdata 1 1 0
ip6_dst_cache 4 15 256 15 1 : tunables 120 60
8 : slabdata 1 1 0
ndisc_cache 1 20 192 20 1 : tunables 120 60
8 : slabdata 1 1 0
RAWv6 5 6 640 6 1 : tunables 54 27
8 : slabdata 1 1 0
UDPv6 0 0 640 6 1 : tunables 54 27
8 : slabdata 0 0 0
tw_sock_TCPv6 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
request_sock_TCPv6 0 0 128 30 1 : tunables 120
60 8 : slabdata 0 0 0
TCPv6 2 3 1280 3 1 : tunables 24 12
8 : slabdata 1 1 0
ip_fib_alias 11 113 32 113 1 : tunables 120 60
8 : slabdata 1 1 0
ip_fib_hash 11 113 32 113 1 : tunables 120 60
8 : slabdata 1 1 0
dm_tio 0 0 16 203 1 : tunables 120 60
8 : slabdata 0 0 0
dm_io 0 0 20 169 1 : tunables 120 60
8 : slabdata 0 0 0
jbd_4k 0 0 4096 1 1 : tunables 24 12
8 : slabdata 0 0 0
scsi_cmd_cache 8 12 320 12 1 : tunables 54 27
8 : slabdata 1 1 0
UNIX 119 144 448 9 1 : tunables 54 27
8 : slabdata 16 16 0
flow_cache 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
msi_cache 4 113 32 113 1 : tunables 120 60
8 : slabdata 1 1 0
cfq_ioc_pool 25 168 92 42 1 : tunables 120 60
8 : slabdata 4 4 0
cfq_pool 26 160 96 40 1 : tunables 120 60
8 : slabdata 4 4 0
crq_pool 17 84 44 84 1 : tunables 120 60
8 : slabdata 1 1 0
deadline_drq 0 0 44 84 1 : tunables 120 60
8 : slabdata 0 0 0
as_arq 0 0 56 67 1 : tunables 120 60
8 : slabdata 0 0 0
mqueue_inode_cache 1 7 576 7 1 : tunables 54
27 8 : slabdata 1 1 0
isofs_inode_cache 0 0 376 10 1 : tunables 54 27
8 : slabdata 0 0 0
minix_inode_cache 0 0 412 9 1 : tunables 54 27
8 : slabdata 0 0 0
ext2_inode_cache 0 0 484 8 1 : tunables 54 27
8 : slabdata 0 0 0
ext2_xattr 0 0 48 78 1 : tunables 120 60
8 : slabdata 0 0 0
journal_handle 16 169 20 169 1 : tunables 120 60
8 : slabdata 1 1 0
journal_head 15 432 52 72 1 : tunables 120 60
8 : slabdata 6 6 1
revoke_table 6 254 12 254 1 : tunables 120 60
8 : slabdata 1 1 0
revoke_record 0 0 16 203 1 : tunables 120 60
8 : slabdata 0 0 0
ext3_inode_cache 1990 1992 500 8 1 : tunables 54 27
8 : slabdata 249 249 0
ext3_xattr 0 0 48 78 1 : tunables 120 60
8 : slabdata 0 0 0
dnotify_cache 1 169 20 169 1 : tunables 120 60
8 : slabdata 1 1 0
dquot 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
eventpoll_pwq 130018 130088 36 101 1 : tunables 120 60
8 : slabdata 1288 1288 0
eventpoll_epi 130018 130020 128 30 1 : tunables 120 60
8 : slabdata 4334 4334 0
inotify_event_cache 0 0 28 127 1 : tunables 120
60 8 : slabdata 0 0 0
inotify_watch_cache 1 92 40 92 1 : tunables 120
60 8 : slabdata 1 1 0
kioctx 0 0 192 20 1 : tunables 120 60
8 : slabdata 0 0 0
kiocb 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
fasync_cache 0 0 16 203 1 : tunables 120 60
8 : slabdata 0 0 0
shmem_inode_cache 423 459 444 9 1 : tunables 54 27
8 : slabdata 51 51 0
posix_timers_cache 0 0 88 44 1 : tunables 120
60 8 : slabdata 0 0 0
uid_cache 5 59 64 59 1 : tunables 120 60
8 : slabdata 1 1 0
ip_mrt_cache 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
tcp_bind_bucket 10 203 16 203 1 : tunables 120 60
8 : slabdata 1 1 0
inet_peer_cache 0 0 64 59 1 : tunables 120 60
8 : slabdata 0 0 0
secpath_cache 0 0 32 113 1 : tunables 120 60
8 : slabdata 0 0 0
xfrm_dst_cache 0 0 320 12 1 : tunables 54 27
8 : slabdata 0 0 0
ip_dst_cache 28 30 256 15 1 : tunables 120 60
8 : slabdata 2 2 0
arp_cache 8 20 192 20 1 : tunables 120 60
8 : slabdata 1 1 0
RAW 3 7 512 7 1 : tunables 54 27
8 : slabdata 1 1 0
UDP 1 7 512 7 1 : tunables 54 27
8 : slabdata 1 1 0
tw_sock_TCP 12 30 128 30 1 : tunables 120 60
8 : slabdata 1 1 0
request_sock_TCP 2 59 64 59 1 : tunables 120 60
8 : slabdata 1 1 0
TCP 130011 130011 1152 7 2 : tunables 24 12
8 : slabdata 18573 18573 0
sgpool-128 32 32 2048 2 1 : tunables 24 12
8 : slabdata 16 16 0
sgpool-64 32 32 1024 4 1 : tunables 54 27
8 : slabdata 8 8 0
sgpool-32 32 32 512 8 1 : tunables 54 27
8 : slabdata 4 4 0
sgpool-16 32 45 256 15 1 : tunables 120 60
8 : slabdata 3 3 0
sgpool-8 40 60 128 30 1 : tunables 120 60
8 : slabdata 2 2 0
scsi_io_context 0 0 104 37 1 : tunables 120 60
8 : slabdata 0 0 0
blkdev_ioc 25 254 28 127 1 : tunables 120 60
8 : slabdata 2 2 0
blkdev_queue 28 28 956 4 1 : tunables 54 27
8 : slabdata 7 7 0
blkdev_requests 17 46 172 23 1 : tunables 120 60
8 : slabdata 2 2 0
biovec-256 11 12 3072 2 2 : tunables 24 12
8 : slabdata 6 6 0
biovec-128 15 15 1536 5 2 : tunables 24 12
8 : slabdata 3 3 0
biovec-64 23 30 768 5 1 : tunables 54 27
8 : slabdata 6 6 0
biovec-16 23 60 192 20 1 : tunables 120 60
8 : slabdata 3 3 0
biovec-4 23 59 64 59 1 : tunables 120 60
8 : slabdata 1 1 0
biovec-1 24 203 16 203 1 : tunables 120 60
8 : slabdata 1 1 0
bio 273 420 128 30 1 : tunables 120 60
8 : slabdata 14 14 0
sock_inode_cache 130158 130158 448 9 1 : tunables 54 27
8 : slabdata 14462 14462 0
skbuff_fclone_cache 60 60 384 10 1 : tunables 54 27
8 : slabdata 6 6 0
skbuff_head_cache 260 260 192 20 1 : tunables 120 60
8 : slabdata 13 13 0
file_lock_cache 16 40 96 40 1 : tunables 120 60
8 : slabdata 1 1 0
Acpi-Operand 2175 2300 40 92 1 : tunables 120 60
8 : slabdata 25 25 0
Acpi-ParseExt 16 84 44 84 1 : tunables 120 60
8 : slabdata 1 1 0
Acpi-Parse 16 127 28 127 1 : tunables 120 60
8 : slabdata 1 1 0
Acpi-State 76 84 44 84 1 : tunables 120 60
8 : slabdata 1 1 0
Acpi-Namespace 1019 1183 20 169 1 : tunables 120 60
8 : slabdata 7 7 0
delayacct_cache 107 312 48 78 1 : tunables 120 60
8 : slabdata 4 4 0
taskstats_cache 19 53 72 53 1 : tunables 120 60
8 : slabdata 1 1 0
proc_inode_cache 773 792 364 11 1 : tunables 54 27
8 : slabdata 72 72 0
sigqueue 13 27 144 27 1 : tunables 120 60
8 : slabdata 1 1 0
radix_tree_node 1613 1624 276 14 1 : tunables 54 27
8 : slabdata 116 116 0
bdev_cache 10 14 512 7 1 : tunables 54 27
8 : slabdata 2 2 0
sysfs_dir_cache 4319 4368 44 84 1 : tunables 120 60
8 : slabdata 52 52 0
mnt_cache 23 30 128 30 1 : tunables 120 60
8 : slabdata 1 1 0
inode_cache 2581 2596 348 11 1 : tunables 54 27
8 : slabdata 236 236 0
dentry_cache 137114 137141 132 29 1 : tunables 120 60
8 : slabdata 4729 4729 0
filp 130851 130880 192 20 1 : tunables 120 60
8 : slabdata 6544 6544 0
names_cache 7 7 4096 1 1 : tunables 24 12
8 : slabdata 7 7 0
idr_layer_cache 115 145 136 29 1 : tunables 120 60
8 : slabdata 5 5 0
buffer_head 5265 5616 52 72 1 : tunables 120 60
8 : slabdata 78 78 0
mm_struct 45 135 448 9 1 : tunables 54 27
8 : slabdata 15 15 0
vm_area_struct 1428 2254 84 46 1 : tunables 120 60
8 : slabdata 49 49 0
fs_cache 51 177 64 59 1 : tunables 120 60
8 : slabdata 3 3 0
files_cache 46 140 384 10 1 : tunables 54 27
8 : slabdata 14 14 0
signal_cache 84 160 384 10 1 : tunables 54 27
8 : slabdata 16 16 0
sighand_cache 87 108 1344 3 1 : tunables 24 12
8 : slabdata 36 36 0
task_struct 104 190 1392 5 2 : tunables 24 12
8 : slabdata 38 38 0
anon_vma 588 1016 12 254 1 : tunables 120 60
8 : slabdata 4 4 0
pgd 38 38 4096 1 1 : tunables 24 12
8 : slabdata 38 38 0
pid 106 303 36 101 1 : tunables 120 60
8 : slabdata 3 3 0
size-131072(DMA) 0 0 131072 1 32 : tunables 8 4
0 : slabdata 0 0 0
size-131072 0 0 131072 1 32 : tunables 8 4
0 : slabdata 0 0 0
size-65536(DMA) 0 0 65536 1 16 : tunables 8 4
0 : slabdata 0 0 0
size-65536 1 1 65536 1 16 : tunables 8 4
0 : slabdata 1 1 0
size-32768(DMA) 0 0 32768 1 8 : tunables 8 4
0 : slabdata 0 0 0
size-32768 17 17 32768 1 8 : tunables 8 4
0 : slabdata 17 17 0
size-16384(DMA) 0 0 16384 1 4 : tunables 8 4
0 : slabdata 0 0 0
size-16384 5 5 16384 1 4 : tunables 8 4
0 : slabdata 5 5 0
size-8192(DMA) 0 0 8192 1 2 : tunables 8 4
0 : slabdata 0 0 0
size-8192 100 108 8192 1 2 : tunables 8 4
0 : slabdata 100 108 0
size-4096(DMA) 0 0 4096 1 1 : tunables 24 12
8 : slabdata 0 0 0
size-4096 15 15 4096 1 1 : tunables 24 12
8 : slabdata 15 15 0
size-2048(DMA) 0 0 2048 2 1 : tunables 24 12
8 : slabdata 0 0 0
size-2048 296 296 2048 2 1 : tunables 24 12
8 : slabdata 148 148 0
size-1024(DMA) 0 0 1024 4 1 : tunables 54 27
8 : slabdata 0 0 0
size-1024 289 300 1024 4 1 : tunables 54 27
8 : slabdata 75 75 0
size-512(DMA) 0 0 512 8 1 : tunables 54 27
8 : slabdata 0 0 0
size-512 423 536 512 8 1 : tunables 54 27
8 : slabdata 67 67 0
size-256(DMA) 0 0 256 15 1 : tunables 120 60
8 : slabdata 0 0 0
size-256 510 525 256 15 1 : tunables 120 60
8 : slabdata 35 35 0
size-128(DMA) 0 0 128 30 1 : tunables 120 60
8 : slabdata 0 0 0
size-128 1161 1200 128 30 1 : tunables 120 60
8 : slabdata 40 40 0
size-64(DMA) 0 0 64 59 1 : tunables 120 60
8 : slabdata 0 0 0
size-32(DMA) 0 0 32 113 1 : tunables 120 60
8 : slabdata 0 0 0
size-64 1215 1239 64 59 1 : tunables 120 60
8 : slabdata 21 21 0
size-32 2963 3164 32 113 1 : tunables 120 60
8 : slabdata 28 28 0
kmem_cache 137 138 640 6 1 : tunables 54 27
8 : slabdata 23 23 0
> cat /proc/net/sockstat
sockets: used 130143
TCP: inuse 130009 orphan 0 tw 11 alloc 130011 mem 30
UDP: inuse 1
RAW: inuse 0
FRAG: inuse 0 memory 0
> cat /proc/net/stat/rt_cache
entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst
in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored
gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search
0000001a 00072721 00000021 00000000 00000000 00000005 00000000
00000000 0001e1b9 0000000c 00000000 00000000 00000000 00000000 00000000
00000000 0000005e
0000001a 0006e116 00000017 00000000 00000000 00000003 00000000
00000000 000216d2 00000005 00000000 00000000 00000000 00000000 00000000
00000000 00000031
> cat /proc/buddyinfo
Node 0, zone DMA 3 2 2 2 3 3
1 1 1 1 2
Node 0, zone Normal 0 12 2 0 1 0
0 0 0 0 13
Node 0, zone HighMem 1088 355 145 44 11 6
1 0 0 0 497
> grep . /proc/sys/net/ipv4/*
/proc/sys/net/ipv4/icmp_echo_ignore_all:0
/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts:1
/proc/sys/net/ipv4/icmp_errors_use_inbound_ifaddr:0
/proc/sys/net/ipv4/icmp_ignore_bogus_error_responses:1
/proc/sys/net/ipv4/icmp_ratelimit:250
/proc/sys/net/ipv4/icmp_ratemask:6168
/proc/sys/net/ipv4/igmp_max_memberships:20
/proc/sys/net/ipv4/igmp_max_msf:10
/proc/sys/net/ipv4/inet_peer_gc_maxtime:120
/proc/sys/net/ipv4/inet_peer_gc_mintime:10
/proc/sys/net/ipv4/inet_peer_maxttl:600
/proc/sys/net/ipv4/inet_peer_minttl:120
/proc/sys/net/ipv4/inet_peer_threshold:65664
/proc/sys/net/ipv4/ip_default_ttl:64
/proc/sys/net/ipv4/ip_dynaddr:0
/proc/sys/net/ipv4/ip_forward:0
/proc/sys/net/ipv4/ip_local_port_range:32768 61000
/proc/sys/net/ipv4/ip_no_pmtu_disc:0
/proc/sys/net/ipv4/ip_nonlocal_bind:0
/proc/sys/net/ipv4/ipfrag_high_thresh:262144
/proc/sys/net/ipv4/ipfrag_low_thresh:196608
/proc/sys/net/ipv4/ipfrag_max_dist:64
/proc/sys/net/ipv4/ipfrag_secret_interval:600
/proc/sys/net/ipv4/ipfrag_time:30
/proc/sys/net/ipv4/tcp_abc:0
/proc/sys/net/ipv4/tcp_abort_on_overflow:0
/proc/sys/net/ipv4/tcp_adv_win_scale:2
/proc/sys/net/ipv4/tcp_app_win:31
/proc/sys/net/ipv4/tcp_base_mss:512
/proc/sys/net/ipv4/tcp_congestion_control:reno
/proc/sys/net/ipv4/tcp_dma_copybreak:4096
/proc/sys/net/ipv4/tcp_dsack:1
/proc/sys/net/ipv4/tcp_ecn:0
/proc/sys/net/ipv4/tcp_fack:1
/proc/sys/net/ipv4/tcp_fin_timeout:60
/proc/sys/net/ipv4/tcp_frto:0
/proc/sys/net/ipv4/tcp_keepalive_intvl:75
/proc/sys/net/ipv4/tcp_keepalive_probes:9
/proc/sys/net/ipv4/tcp_keepalive_time:7200
/proc/sys/net/ipv4/tcp_low_latency:0
/proc/sys/net/ipv4/tcp_max_orphans:32768
/proc/sys/net/ipv4/tcp_max_syn_backlog:1024
/proc/sys/net/ipv4/tcp_max_tw_buckets:180000
/proc/sys/net/ipv4/tcp_mem:98304 131072 196608
/proc/sys/net/ipv4/tcp_moderate_rcvbuf:1
/proc/sys/net/ipv4/tcp_mtu_probing:0
/proc/sys/net/ipv4/tcp_no_metrics_save:0
/proc/sys/net/ipv4/tcp_orphan_retries:0
/proc/sys/net/ipv4/tcp_reordering:3
/proc/sys/net/ipv4/tcp_retrans_collapse:1
/proc/sys/net/ipv4/tcp_retries1:3
/proc/sys/net/ipv4/tcp_retries2:15
/proc/sys/net/ipv4/tcp_rfc1337:0
/proc/sys/net/ipv4/tcp_rmem:4096 87380 4194304
/proc/sys/net/ipv4/tcp_sack:1
/proc/sys/net/ipv4/tcp_slow_start_after_idle:1
/proc/sys/net/ipv4/tcp_stdurg:0
/proc/sys/net/ipv4/tcp_syn_retries:5
/proc/sys/net/ipv4/tcp_synack_retries:5
/proc/sys/net/ipv4/tcp_syncookies:1
/proc/sys/net/ipv4/tcp_timestamps:1
/proc/sys/net/ipv4/tcp_tso_win_divisor:3
/proc/sys/net/ipv4/tcp_tw_recycle:0
/proc/sys/net/ipv4/tcp_tw_reuse:0
/proc/sys/net/ipv4/tcp_window_scaling:1
/proc/sys/net/ipv4/tcp_wmem:4096 16384 4194304
/proc/sys/net/ipv4/tcp_workaround_signed_windows:0
> grep . /proc/sys/net/ipv4/route/*
/proc/sys/net/ipv4/route/error_burst:1250
/proc/sys/net/ipv4/route/error_cost:250
/proc/sys/net/ipv4/route/gc_elasticity:8
/proc/sys/net/ipv4/route/gc_interval:60
/proc/sys/net/ipv4/route/gc_min_interval:0
/proc/sys/net/ipv4/route/gc_min_interval_ms:500
/proc/sys/net/ipv4/route/gc_thresh:32768
/proc/sys/net/ipv4/route/gc_timeout:300
/proc/sys/net/ipv4/route/max_delay:10
/proc/sys/net/ipv4/route/max_size:524288
/proc/sys/net/ipv4/route/min_adv_mss:256
/proc/sys/net/ipv4/route/min_delay:2
/proc/sys/net/ipv4/route/min_pmtu:552
/proc/sys/net/ipv4/route/mtu_expires:600
/proc/sys/net/ipv4/route/redirect_load:5
/proc/sys/net/ipv4/route/redirect_number:9
/proc/sys/net/ipv4/route/redirect_silence:5120
/proc/sys/net/ipv4/route/secret_interval:600
Markus
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-05 8:20 ` Markus Wenke
@ 2006-10-05 8:45 ` Eric Dumazet
2006-10-05 9:16 ` Markus Wenke
0 siblings, 1 reply; 9+ messages in thread
From: Eric Dumazet @ 2006-10-05 8:45 UTC (permalink / raw)
To: Markus Wenke; +Cc: Alan Cox, linux-kernel
On Thursday 05 October 2006 10:20, Markus Wenke wrote:
> Eric Dumazet schrieb:
> > Could you post here the result of these commands when your system is
> > using more than 100.000 connections (and before the OOM :) )
>
> Hi,
>
> here the results with 130001 connetions
>
> > cat /proc/meminfo
>
> MemTotal: 3108372 kB
> MemFree: 2114404 kB
> Buffers: 5112 kB
> Cached: 97804 kB
> SwapCached: 0 kB
> Active: 140552 kB
> Inactive: 38948 kB
> HighTotal: 2228160 kB
> HighFree: 2048108 kB
> LowTotal: 880212 kB
> LowFree: 66296 kB
See here ? you have 'only' 880212 kB of LOWMEM, and 66 MB free.
all kernel structures (you can see them in /proc/slabinfo) are lying on this
zone, no matter you add RAM on your machine (more RAM end up in HighMEM zone,
wich is basically unused on your setup)
Since you have a 64bits CPU, your best move would be to use a 64bits kernel
(you can keep all user land in 32bits mode)
With a 64bits kernel, kernel land structures would not be constrained in a
small area, but can use full RAM.
I'm curious you have so many sockets but few entries in route cache...
basically all connections come from few machines ?
Eric
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-05 8:45 ` Eric Dumazet
@ 2006-10-05 9:16 ` Markus Wenke
0 siblings, 0 replies; 9+ messages in thread
From: Markus Wenke @ 2006-10-05 9:16 UTC (permalink / raw)
To: Eric Dumazet; +Cc: Alan Cox, linux-kernel
Eric Dumazet schrieb:
> On Thursday 05 October 2006 10:20, Markus Wenke wrote:
>
>> Eric Dumazet schrieb:
>>
>
>
>>> Could you post here the result of these commands when your system is
>>> using more than 100.000 connections (and before the OOM :) )
>>>
>> Hi,
>>
>> here the results with 130001 connetions
>>
>>
>>> cat /proc/meminfo
>>>
>> MemTotal: 3108372 kB
>> MemFree: 2114404 kB
>> Buffers: 5112 kB
>> Cached: 97804 kB
>> SwapCached: 0 kB
>> Active: 140552 kB
>> Inactive: 38948 kB
>> HighTotal: 2228160 kB
>> HighFree: 2048108 kB
>> LowTotal: 880212 kB
>> LowFree: 66296 kB
>>
>
> See here ? you have 'only' 880212 kB of LOWMEM, and 66 MB free.
> all kernel structures (you can see them in /proc/slabinfo) are lying on this
> zone, no matter you add RAM on your machine (more RAM end up in HighMEM zone,
> wich is basically unused on your setup)
>
> Since you have a 64bits CPU, your best move would be to use a 64bits kernel
> (you can keep all user land in 32bits mode)
>
> With a 64bits kernel, kernel land structures would not be constrained in a
> small area, but can use full RAM.
>
I think I change to the 64 Bit-Kernel ;-).
btw: with the Xen-patched Kernel I get this at 130000 connections:
MemTotal: 2979840 kB
MemFree: 2394544 kB
Buffers: 5748 kB
Cached: 104492 kB
SwapCached: 0 kB
Active: 146632 kB
Inactive: 43276 kB
HighTotal: 2136004 kB
HighFree: 1943728 kB
LowTotal: 843836 kB
LowFree: 450816 kB
SwapTotal: 2104472 kB
SwapFree: 2104472 kB
Dirty: 412 kB
Writeback: 0 kB
Mapped: 89556 kB
Slab: 285284 kB
CommitLimit: 3594392 kB
Committed_AS: 205244 kB
PageTables: 756 kB
VmallocTotal: 114680 kB
VmallocUsed: 4576 kB
VmallocChunk: 109280 kB
> I'm curious you have so many sockets but few entries in route cache...
> basically all connections come from few machines ?
>
My test scenario has only 5 clients, so I must make the connections with
a few clients.
Thanks a lot
Markus Wenke
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: to many sockets ?
2006-10-05 7:14 ` Markus Wenke
2006-10-05 7:58 ` Eric Dumazet
@ 2006-10-05 21:30 ` Alan Cox
2006-10-06 5:32 ` Markus Wenke
1 sibling, 1 reply; 9+ messages in thread
From: Alan Cox @ 2006-10-05 21:30 UTC (permalink / raw)
To: Markus Wenke; +Cc: linux-kernel
Ar Iau, 2006-10-05 am 09:14 +0200, ysgrifennodd Markus Wenke:
> and the oom-killer kills my application at the same time (at 140000
> connections).
>
> I can not see in the messages that the system is out of memory,
> there is also no swap space used
>
> You can download my /var/log/messages at
> http://hemaho.mine.nu/~biber/messages
>
> May you can give me a hint which line/value in the log shows me,
> that the system is out of memory?
That sounds like a bug. What kernel are you using ?
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2006-10-06 5:32 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2006-10-04 15:03 to many sockets ? Markus Wenke
2006-10-04 16:33 ` Alan Cox
2006-10-05 7:14 ` Markus Wenke
2006-10-05 7:58 ` Eric Dumazet
2006-10-05 8:20 ` Markus Wenke
2006-10-05 8:45 ` Eric Dumazet
2006-10-05 9:16 ` Markus Wenke
2006-10-05 21:30 ` Alan Cox
2006-10-06 5:32 ` Markus Wenke
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