> -----Original Message-----
> From: Neil Brown [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 26, 2000 7:41 PM
> To: Anton
> Cc: [EMAIL PROTECTED]
> Subject: Re: raid and 2.4 kernels
>
> On Wednesday July 26, [EMAIL PROTECTED] wrote:
> > do the kernel developers responsible for RAID read this
> list? I would be
> > interested in seeing some constructive discussion about the
> reports of
> > degraded RAID performance in the 2.4 kernels. It is particularly
> > disappointing given that SMP appears to be a lot better in
> 2.4 vs 2.2
>
> As Jakob mentioned, the slow down is quite possibly related to other
> parts of the kernel.
> I would really like to see speed comparisons for
>
> 2.2 no raid
> 2.2 raid
> 2.4 no raid
> 2.4 raid
>
> where 2.3+raid didn't fit the pattern, before I looked too deeply.
>
> Given the code at the moment, I am highly confident that linear, raid0
> and raid1 should be just as fast in 2.4 as in 2.2.
> There are some issues with raid5 that I am looking into. I don't
> know that they affect speed much, though they might.
Could you be a little more specific? Speed comparisons on disk access?
Then you can't compare RAID with no RAID effectively. You could compare the
speed of 2.2/2.4 RAID, and 2.2/2.4 no RAID, but comparisons across would
seem to be meaningless. Later,
Grego
