Re: [Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
From: Eric Dumazet <[EMAIL PROTECTED]> Date: Tue, 21 Mar 2006 15:17:17 +0100 > I would like to point out that struct tcp_sock was enlarged in > 2.6.15, and the 'TCP' kmem_cache now needs order-1 allocations > instead of order-0 Thanks for pointing this out Eric, I'll see what I can do to trim it down a bit. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
On Tuesday 21 March 2006 15:17, Eric Dumazet wrote: > This is a new point of failure for x86 machines that use lot of tcp sockets, > I > learnt it the bad way and had to revert to 2.6.14 some servers that cannot > run > stock 2.6.15/2.6.16 for long because of this problem. x86-64/ppc64/other 64bit with 4k page machines always had this problem but I'm not aware of people hitting it in practice. > > Of course, we might argue the problem come from linux memory management... > Oh well... I'm sure there are ways to put struct sock / tcp_sock to a diet. From a quick look a lot of ints could be shorts, the function pointer callbacks could be moved out to a different structure. Maybe all those new hints recently added could be moved into a separate structure and only be allocated if the socket has a large window. Some fields only used by LISTEN sockets (e.g. last_synq_overflow) could be unioned with ESTABLISHED data. Probably more opportunities for this. etc.etc. -Andi - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
[Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
Hi all I would like to point out that struct tcp_sock was enlarged in 2.6.15, and the 'TCP' kmem_cache now needs order-1 allocations instead of order-0 In 2.6.14 : # grep "^TCP" /proc/slabinfo TCP 64 7696041 : tunables 54 270 : slabdata 19 19 0 In 2.6.16 / 2.6.15 : grep "^TCP" /proc/slabinfo TCP 16 28 115272 : tunables 24 128 : slabdata 4 4 0 This is a new point of failure for x86 machines that use lot of tcp sockets, I learnt it the bad way and had to revert to 2.6.14 some servers that cannot run stock 2.6.15/2.6.16 for long because of this problem. Of course, we might argue the problem come from linux memory management... Oh well... Thank you Eric Dumazet - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
Ismail Donmez a écrit : This is a new point of failure for x86 machines that use lot of tcp sockets, I learnt it the bad way and had to revert to 2.6.14 some servers that cannot run stock 2.6.15/2.6.16 for long because of this problem. It seems to be 1024 here, maybe its your config ? [EMAIL PROTECTED] ~ $ grep "^TCP" /proc/slabinfo TCP9 12 102441 : tunables 54 270 : slabdata 3 3 0 [EMAIL PROTECTED] ~ $ uname -a Linux southpark 2.6.16 #7 Mon Mar 20 21:16:42 EET 2006 i686 i686 i386 GNU/Linux Yes, I should have mentioned my servers were SMP :) Your kernel build is uniprocessor. Eric - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
Salı 21 Mart 2006 16:40 tarihinde, Eric Dumazet şunları yazmıştı: > Ismail Donmez a écrit : > >> This is a new point of failure for x86 machines that use lot of tcp > >> sockets, I learnt it the bad way and had to revert to 2.6.14 some > >> servers that cannot run stock 2.6.15/2.6.16 for long because of this > >> problem. > > > > It seems to be 1024 here, maybe its your config ? > > > > [EMAIL PROTECTED] ~ $ grep "^TCP" /proc/slabinfo > > TCP9 12 102441 : tunables 54 27 > > 0 : slabdata 3 3 0 > > [EMAIL PROTECTED] ~ $ uname -a > > Linux southpark 2.6.16 #7 Mon Mar 20 21:16:42 EET 2006 i686 i686 i386 > > GNU/Linux > > Yes, I should have mentioned my servers were SMP :) Ah, ok then. Regards, ismail -- An eye for eye will make the whole world blind -- Gandhi pgpvwuoCmAs9Z.pgp Description: PGP signature
Re: [Comment] sizeof("struct tcp_sock") is above 1024 on x86 since linux-2.6.15
Salı 21 Mart 2006 16:17 tarihinde şunları yazmıştınız: > Hi all > > I would like to point out that struct tcp_sock was enlarged in 2.6.15, and > the 'TCP' kmem_cache now needs order-1 allocations instead of order-0 > > > In 2.6.14 : > > # grep "^TCP" /proc/slabinfo > TCP 64 7696041 : tunables 54 270 > : slabdata 19 19 0 > > In 2.6.16 / 2.6.15 : > > grep "^TCP" /proc/slabinfo > TCP 16 28 115272 : tunables 24 128 > : slabdata 4 4 0 > > > This is a new point of failure for x86 machines that use lot of tcp > sockets, I learnt it the bad way and had to revert to 2.6.14 some servers > that cannot run stock 2.6.15/2.6.16 for long because of this problem. It seems to be 1024 here, maybe its your config ? [EMAIL PROTECTED] ~ $ grep "^TCP" /proc/slabinfo TCP9 12 102441 : tunables 54 270 : slabdata 3 3 0 [EMAIL PROTECTED] ~ $ uname -a Linux southpark 2.6.16 #7 Mon Mar 20 21:16:42 EET 2006 i686 i686 i386 GNU/Linux Regards, ismail -- An eye for eye will make the whole world blind -- Gandhi pgpJCHjcNryxk.pgp Description: PGP signature
