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

Chris Evans
2000-10-11T22:46:19Z

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