netdev - Re: TCP connection stops after high load.

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Message-ID: <7e63f56c0704161151p405c4597x5fbac6021b635d84@mail.gmail.com>
Date:	Mon, 16 Apr 2007 20:51:54 +0200
From:	"Robert Iakobashvili" <coroberti@...il.com>
To:	"John Heffner" <jheffner@....edu>
Cc:	"David Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	greearb@...delatech.com
Subject: Re: TCP connection stops after high load.

> >> Robert Iakobashvili wrote:
> >> > Vanilla 2.6.18.3 works for me perfectly, whereas 2.6.19.5 and
> >> > 2.6.20.6 do not.
> >> >
> >> > Looking into the tcp /proc entries of 2.6.18.3 versus 2.6.19.5
> >> > tcp_rmem and tcp_wmem are the same, whereas tcp_mem are
> >> > much different:
> >> >
> >> > kernel                  tcp_mem
> >> > ---------------------------------------
> >> > 2.6.18.3    12288 16384 24576
> >> > 2.6.19.5      3072    4096   6144
> >
> >> Another patch that went in right around that time:
> >>
> >> commit 52bf376c63eebe72e862a1a6e713976b038c3f50
> >> Author: John Heffner <jheffner@....edu>
> >> Date:   Tue Nov 14 20:25:17 2006 -0800
> >>
> >>      [TCP]: Fix up sysctl_tcp_mem initialization.
> >> (This has been changed again for 2.6.21.)
> >>

> Yes, this difference is caused by the commit above.
> The current net-2.6 (2.6.21) has a redesigned tcp_mem initialization
> that should give you more appropriate values, something like 45408 60546
> 90816.  For reference:
> Commit: 53cdcc04c1e85d4e423b2822b66149b6f2e52c2c
> Author: John Heffner <jheffner@....edu> Fri, 16 Mar 2007 15:04:03 -0700
>
>      [TCP]: Fix tcp_mem[] initialization.
>      Change tcp_mem initialization function.  The fraction of total memory
>      is now a continuous function of memory size, and independent of page
>      size.


Kernels 2.6.19 and 2.6.20 series are effectively broken right now.
Don't you wish to patch them?

-- 
Sincerely,
Robert Iakobashvili,
coroberti %x40 gmail %x2e com
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