Re: MD write performance issue - found Catalyst patches

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On Fri, November 6, 2009 9:28 pm, Asdo wrote:
> 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

Those patches are in 2.6.32-rc:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1d9d52416c0445019ccc1f0fddb9a227456eb61b

however I haven't submitted them for -stable.  Maybe I should...

Thanks.
NeilBrown


>

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