From: Marc-Christian Petersen <m.c.p@wolk-project.de>
Organization: Working Overloaded Linux Kernel
To: Andrea Arcangeli <andrea@suse.de>
Subject: Re: -rc7   Re: Linux 2.4.21-rc6
Date: Wed, 4 Jun 2003 13:01:02 +0200
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Cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
       Georg Nikodym <georgn@somanetworks.com>,
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On Wednesday 04 June 2003 12:43, Andrea Arcangeli wrote:

Hi Andrea,

> sure, it's just a matter of adding a bit to the blkdev structure.
> However I'm not 100% sure that it is the real thing that could make the
> difference, but overall the exclusive wakeup FIFO in theory should
> provide even an higher degree of fariness, so at the very least the
> "fix" 2 from Andrew makes very little sense to me, and it seems just an
> hack meant to hide a real problem in the algorithm.
well, at least it reduces pauses/stops ;)

> As for 1 and 3 they were just included in my tree for ages.
err, 1 yes, but I don't see that 3 is in your tree. Well, ok, a bit different. 
But hey, your 1+3 are still having pauses ;)

> BTW, Chris recently spotted a nearly impossible to trigger SMP-only race
> in the fix pausing patch [great spotting Chris] (to trigger it would
Cool Chris!

> need an intersection of two races at the same time), it'll be fixed in
> my next tree, however nobody ever reproduced it and you certainly can
> ignore it in practice so it can't explain any issue.
Good to know. Thanks.

ciao, Marc

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