Re: Major network performance regression in 3.7

From: Eric Dumazet
Date: Sun Jan 06 2013 - 13:43:19 EST

On Sun, 2013-01-06 at 10:39 -0800, Eric Dumazet wrote:
> On Sun, 2013-01-06 at 18:35 +0100, Willy Tarreau wrote:
> > Unfortunately it does not work any better, which means to me
> > that we don't leave via this code path. I tried other tricks
> > which failed too. I need to understand this part better before
> > randomly fiddling with it.
> >
> OK, now I have your test program, I can work on a fix, dont worry ;)
> The MSG_SENDPAGE_NOTLAST logic needs to be tweaked.

(sd->len is usually 4096, which is expected, but sd->total_len value is
huge in your case, so we always set the flag in fs/splice.c)

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