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

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Message-ID: <46B83560.2060107@interia.pl>
Date:	Tue, 07 Aug 2007 11:03:28 +0200
From:	Rafał Bilski <rafalbilski@...eria.pl>
To:	Dimitrios Apostolou <jimis@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: high system cpu load during intense disk i/o

>> Just tested (plain curiosity).
>> via82cxxx average result @533MHz:
>> /dev/hda:
>> Timing cached reads:   232 MB in  2.00 seconds = 115.93 MB/sec
>> Timing buffered disk reads:   64 MB in  3.12 seconds =  20.54 MB/sec
>> pata_via average result @533MHz:
>> /dev/sda:
>> Timing cached reads:   234 MB in  2.01 seconds = 116.27 MB/sec
>> Timing buffered disk reads:   82 MB in  3.05 seconds =  26.92 MB/sec
> 
> Interesting! I haven't tried libata myself on that system, I only have 
> remote access to it so I'm a bit afraid...
Just change root=/dev/hda1 to append="root=/dev/sda1" in lilo.conf.
And change fstab. If You don't change "/" then system will go into single 
user mode after reboot.
> Rafal, I hope that system you run hdparm on isn't the archlinux one! Is 
> it easy to load an old kernel (even two years old) and do the same test? 
> If it is, please let me know of the results.
I don't think it is possible. If I remember right kernel can't be older  
then glibc kernel headers.
Btw. My disk is 20GB 2,5" ATA33. I wonder how 26MB/s is possible. I don't 
expect more.
> 
> Thanks in advance,
> Dimitris
Regards
Rafał

----------------------------------------------------------------------
Wszystko czego potrzebujesz latem: kremy do opalania, 
stroje kapielowe, maly romans 

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