linux-kernel - Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

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Message-ID: <20060918210849.GA31746@tentacle.sectorb.msk.ru>
Date:	Tue, 19 Sep 2006 01:08:49 +0400
From:	"Vladimir B. Savkin" <master@...torb.msk.ru>
To:	Andi Kleen <ak@...e.de>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>,
	Harry Edmon <harry@...os.washington.edu>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Andi Kleen <ak@...e.de>
Subject: Re: Network performance degradation from 2.6.11.12 to 2.6.16.20

On Mon, Sep 18, 2006 at 01:27:57PM +0200, Andi Kleen wrote:
> The codebase for timing (and lots of other things) is quite different
> between 32bit and 64bit. You're really surprised it doesn't work if you do such things?
> 
It works, and after your remark above, I'm surprised.
Dunno about slow TSC drift though, there was not enough time passed to
detect it, and I hope we will have this problem soved in a better way
before the drift becomes visible :)

> > But the question is, why stock 2.6.18-rc7 could not use TSC on its own?
> 
> x86-64 doesn't use the TSC when it deems it to not be reliable, which
> is the case on your system.
>  
Could it at least print something so that I know that using TSC  was
considered, but rejected?

> > What hardware exactly. Doesn't it affect only CPU? And they are not
> > know to fail before any other components.
> 
> All hardware. It's basic physics.

Hm, what other hardware is affected by idle=poll? Does this option ear
out HDDs?
~
:wq
                                        With best regards, 
                                           Vladimir Savkin. 

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