linux-kernel - Re: hackbench regression due to commit 9dfc6e68bfe6e

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Message-ID: <1270711551.2215.5.camel@edumazet-laptop>
Date:	Thu, 08 Apr 2010 09:25:51 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	yanmin_zhang@...ux.intel.com, cl@...ux-foundation.org,
	penberg@...helsinki.fi, netdev@...r.kernel.org, tj@...nel.org,
	alex.shi@...el.com, linux-kernel@...r.kernel.org,
	ling.ma@...el.com, tim.c.chen@...el.com, akpm@...ux-foundation.org
Subject: Re: hackbench regression due to commit 9dfc6e68bfe6e

Le jeudi 08 avril 2010 à 00:05 -0700, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Thu, 08 Apr 2010 09:00:19 +0200
> 
> > If run individually, the tests results are more what we would expect
> > (slow), but if machine runs the two set of process concurrently, each
> > group runs much faster...
> 
> BTW, I just discovered (thanks to the function graph tracer, woo hoo!)
> that loopback TCP packets get fully checksum validated on receive.
> 
> I'm trying to figure out why skb->ip_summed ends up being
> CHECKSUM_NONE in tcp_v4_rcv() even though it gets set to
> CHECKSUM_PARTIAL in tcp_sendmsg().
> 
> I wonder how much this accounts for some of the hackbench
> oddities... and other regressions in loopback tests we've seen.
> :-)
> 
> Just FYI...

Thanks !

But hackbench is a af_unix benchmark, so loopback stuff is not used that
much :)


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