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SubjectRe: Some problems with the raid-stuff in 2.4.0-test12pre3
On Friday December 1, sky@sysv.de wrote:
> On Fri, Dec 01, 2000 at 01:11:45PM +1100, Neil Brown wrote:
> > On Thursday November 30, sky@dereference.de wrote:
> > > Hello people,
> > >
> > > I have some trouble with the raid-stuff.
...
> >
> > Is it just "very slow", but it eventually finishes, it is it so slow,
> > that it actually stops and doesn't make any progress at all?
> >
> > raid5 in 2.4 is definately slower than in 2.2. Could that be all that
> > you are seeing?
>
> It's so slow that it's unusable. Especially writing. open() and
> close()-calls often hang for 20 seconds or more.
> write-calls hang for 3-4 seconds. This has to be a bug.
> But yes, after a long time, it finishes ;)

Well, that does sound slower than I would expect....

1/ Could you try:

http://cgi.cse.unsw.edu.au/~neilb/patches/linux/2.4.0-test12-pre3/patch-E-raid5

and tell me how much that helps.


2/ Try a larger chunk size. My testing suggests 64K is a good
starting point.

NeilBrown
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