linux-kernel - Re: high system cpu load during intense disk i/o

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Message-ID: <46BC0E5B.6030403@interia.pl>
Date:	Fri, 10 Aug 2007 09:06:03 +0200
From:	Rafał Bilski <rafalbilski@...eria.pl>
To:	Dimitrios Apostolou <jimis@....net>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: high system cpu load during intense disk i/o

> So I would assume that delay_tsc() probably only makes the situation worse for 
> the libata tests, but the real problem is at __switch_to() and schedule(). Do 
> you agree with these assumptions?
Yes. I agree that percentage of CPU time is unreasonably high for these 
functions. But not only for them.
> Is there a way to for oprofile to report the time spent in function calls 
> depending on the call trace?
I don't know any.
> Thanks again for the help. I guess if that doesn't lead anywhere I'll just 
> start compiling older vanilla kernels and see when the problem dissapears. 
> But this needs a lot of time and I'm not sure for how long I'll be able to 
> not offer any service with those disks (I was supposed to use RAID 0 to 
> provide storage space with them, but with the current problems that wouldn't 
> be so wise).
Probably this is the best and fastest way to diagnose problem.
> Dimitris
Regards
Rafał


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