Re: 2.4.0test9 vm: disappointing streaming i/o under load

On Thu, 12 Oct 2000, Roger Larsson wrote:

Hi,

(you do have DMA enabled...)

Oh yes (discovering that in fact my chipset is only UDMA33 in the
process).

I have tested throughput - new kernels are rather good.

I don't doubt it. I'll try and post some numbers on this later.

I have also tested latency stuff in test9 - I have not
seen any thing as bad as your results.
But my audio apps runs with high priority...

To be able to determine the cause
Try to to renice your audio deamon (and audio clients)
 renice -10 <pid>


Did it become better?

Not noticeably :-(

Perhaps I'm just asking too much, booting with mem=32M. No point testing
the new VM with a 128Mb desktop, though; it wouldn't break a
sweat!

2.2 (RH7.0 kernel) does skip less, though, and the duration of skip is
less.

Perhaps the two kernels have different elevator settings?

Cheers
Chris

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