Message-ID: <4921F28F.4020300@cosmosbay.com>
Date: Mon, 17 Nov 2008 23:39:11 +0100
From: Eric Dumazet <dada1@cosmosbay.com>
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To: Ingo Molnar <mingo@elte.hu>
CC: Linus Torvalds <torvalds@linux-foundation.org>,
       David Miller <davem@davemloft.net>, rjw@sisk.pl,
       linux-kernel@vger.kernel.org, kernel-testers@vger.kernel.org,
       cl@linux-foundation.org, efault@gmx.de, a.p.zijlstra@chello.nl,
       Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [Bug #11308] tbench regression on each kernel release from	2.6.22
 -&gt; 2.6.28
References: <20081117161135.GE12081@elte.hu> <49219D36.5020801@cosmosbay.com> <20081117170844.GJ12081@elte.hu> <20081117172549.GA27974@elte.hu> <4921AAD6.3010603@cosmosbay.com> <alpine.LFD.2.00.0811170937540.3468@nehalem.linux-foundation.org> <20081117182320.GA26844@elte.hu> <20081117184951.GA5585@elte.hu> <20081117220828.GB6398@elte.hu> <4921ED16.9050307@cosmosbay.com> <20081117222640.GA17880@elte.hu>
In-Reply-To: <20081117222640.GA17880@elte.hu>
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Ingo Molnar a ?crit :
> * Eric Dumazet <dada1@cosmosbay.com> wrote:
> 
>> Ingo Molnar a ?crit :

>>> it's this division:
>>>
>>>         if (doing_tso) {
>>>         [...]
>>> 			xmit_size_goal -= (xmit_size_goal % mss_now);
>>>
>>> Has no-one hit this before? Perhaps this is why switching loopback  
>>> networking to TSO had a performance impact for others?
>> Yes, I mentioned it later. [...]
> 
> i see - i just caught up with some of my inbox from today.
> 
>> [...] But apparently you dont read my mails, so I will just stop 
>> now.
> 
> Sorry, i spent my time looking at the profile output.
> 

No problem Ingo, I am very glad you take so much time to profil kernel ;)

I had too many problems with profilers on my dev machine lately :(


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