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

Rafał Bilski
2007-08-07T09:03:56Z

>> 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

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