linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-ID: <4921F28F.4020300@cosmosbay.com>
Date:	Mon, 17 Nov 2008 23:39:11 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	cl@...ux-foundation.org, efault@....de, a.p.zijlstra@...llo.nl,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [Bug #11308] tbench regression on each kernel release from	2.6.22
 -&gt; 2.6.28

Ingo Molnar a écrit :
> * Eric Dumazet <dada1@...mosbay.com> wrote:
> 
>> Ingo Molnar a écrit :

>>> 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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