Re: ext4 vs btrfs performance on SSD array

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On Wed, Sep 03, 2014 at 10:01:58AM +1000, NeilBrown wrote:
> Do we still need maximums at all?

I don't think we do.  At least on any system I work with I have to
increase them to get good performance without any adverse effect on
throttling.

> So can we just remove the limit on max_sectors and the RAID5 stripe cache
> size?  I'm certainly keen to remove the later and just use a mempool if the
> limit isn't needed.
> I have seen reports that a very large raid5 stripe cache size can cause
> a reduction in performance.  I don't know why but I suspect it is a bug that
> should be found and fixed.
> 
> Do we need max_sectors ??

I'll send a patch to remove it and watch for the fireworks..
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