Re: MD write performance issue - found Catalyst patches

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Neil Brown wrote:
On Thursday November 5, asdo@xxxxxxxxxxxxx wrote:
incentive for upgrading (Neil, btw, is there any chance those lockups fixes get backported to mainstream 2.6.31.x?).

That would be up to the XFS developers.  I suggest you consider asking
them.
Hi Neil, no sorry I meant the patches for md raid lockups like this one:
http://neil.brown.name/git?p=md;a=commitdiff;h=1d9d52416c0445019ccc1f0fddb9a227456eb61b
and those for raid 5,6 for which i don't know the link...
Hm actually I don't see them applied to even mainstream 2.6.32 yet :-(
http://git.kernel.org/?p=linux/kernel/git/djbw/md.git;a=blob_plain;f=drivers/md/raid1.c;hb=2fdc246aaf9a7fa088451ad2a72e9119b5f7f029
am I correct?
The bug can be serious imho depending on the hardware: when I saw it on my hardware all disk accesses were completely starved forever and it was even impossible to log-in until the resync finished. It can actually be worked around by reducing the maximum resync speed, but this is only if the user knows the trick...
Thank you
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