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

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Message-Id: <200708071750.51019.jimis@gmx.net>
Date:	Tue, 7 Aug 2007 17:50:50 +0300
From:	Dimitrios Apostolou <jimis@....net>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rafał Bilski <rafalbilski@...eria.pl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: high system cpu load during intense disk i/o

Hello again, 

I 'm now using libata on the same system described before (see attached 
dmesg.txt). When writing to both disks I think the problem is now worse 
(pata_oprof_bad.txt, pata_vmstat_bad.txt), even the oprofile script needed 
half an hour to complete! For completion I also attach the same tests when I 
write to only one disk (pata_vmstat_1disk.txt, pata_oprof_1disk.txt), whence 
everything is normal. 

FWIW, libata did not give me any performance benefit, 20MB/s is again the peak 
hdparm reports. 

Thanks, 
Dimitris

View attachment "pata_vmstat_1disk.txt" of type "text/plain" (936 bytes)

View attachment "pata_oprof_1disk.txt" of type "text/plain" (18351 bytes)

View attachment "pata_oprof_bad.txt" of type "text/plain" (25267 bytes)

View attachment "pata_vmstat_bad.txt" of type "text/plain" (936 bytes)

View attachment "dmesg.txt" of type "text/plain" (12115 bytes)