netdev - Re: Major network performance regression in 3.7

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 06 Jan 2013 10:43:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willy Tarreau <w@....eu>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Major network performance regression in 3.7

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)


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html