Mailinglist Archive: opensuse (2700 mails)
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Re: [SLE] DMA mode
- From: Alexandr Malusek <Alexandr.Malusek@xxxxxxxxxx>
- Date: Tue, 19 Jul 2005 14:32:18 +0200
- Message-id: <86d5pff031.fsf@xxxxxxxxxxxxxxxxx>
Mitja <ajtim@xxxxxxxxx> writes:
> I have UltraDMA/100 for /dev/hda on. I don't know why is CPU % so high.
>
> Bonnie: Warning: You have 501MB RAM, but you test with only 100MB datasize!
> Bonnie: This might yield unrealistically good results,
> Bonnie: for reading and seeking and writing.
> Bonnie 1.4: File './Bonnie.29824', size: 104857600, volumes: 1
> Writing with putc()... done: 35403 kB/s 99.0 %CPU
> Rewriting... done: 323223 kB/s 100.0 %CPU
> Writing intelligently... done: 327449 kB/s 98.2 %CPU
> Reading with getc()... done: 44625 kB/s 99.6 %CPU
> Reading intelligently... done: 722867 kB/s 99.5 %CPU
IMHO because "You have 501MB RAM, but you test with only 100MB
datasize". Look at the numbers: no current hard disk has the
throughput of 320 MB/s. You test the performance of your memory
subsystem instead.
--
A.M.
> I have UltraDMA/100 for /dev/hda on. I don't know why is CPU % so high.
>
> Bonnie: Warning: You have 501MB RAM, but you test with only 100MB datasize!
> Bonnie: This might yield unrealistically good results,
> Bonnie: for reading and seeking and writing.
> Bonnie 1.4: File './Bonnie.29824', size: 104857600, volumes: 1
> Writing with putc()... done: 35403 kB/s 99.0 %CPU
> Rewriting... done: 323223 kB/s 100.0 %CPU
> Writing intelligently... done: 327449 kB/s 98.2 %CPU
> Reading with getc()... done: 44625 kB/s 99.6 %CPU
> Reading intelligently... done: 722867 kB/s 99.5 %CPU
IMHO because "You have 501MB RAM, but you test with only 100MB
datasize". Look at the numbers: no current hard disk has the
throughput of 320 MB/s. You test the performance of your memory
subsystem instead.
--
A.M.
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