"pcg( Marc)"@goof(A.).(Lehmann )com wrote:
>
> I wondered why my raid systems became so slow recently and found the
> reason: when a reiserfs filesystems gets 90% full it starts to become
> VERY slow on writes. My filesystems usually do in excess of 20MB/s when
> writing, but this degrades to about 10mb/s at 95% and goes down to 1mb/s
> at 98%. When deleting files again the filesystem becomes faster again.
>
> Now, the rule is that you need about 5% of free space on an ext2 disk to
> keep it defragmented, but in practise you need one GB or so and everything
> will always be fine. Degradation never becomes more than a few percent
> even on totally full ext2 partitions.
>
> I think I remember that reiserfs needs 90% of free space (and this indeed
> is backed up by the speed I see), but this means 20-40GB of free, unused
> space on these disks (which seems a bit excessive).
>
> I am using linux-2.4.8ac9 currently, and it may be possible that other
> kernels didn't show this behaviour (I didn't use the ac series before). In
> any case, is this a bug and is there a fix available?
>
> Thanks a lot for any info ;)
>
> --
> -----==- |
> ----==-- _ |
> ---==---(_)__ __ ____ __ Marc Lehmann +--
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> -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+
> The choice of a GNU generation |
> |
You need the patch Yura recently posted, it will help things a lot.
Hans
