> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx
> [mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Johnny Hughes
> Sent: Friday, February 23, 2007 4:46 PM
> To: CentOS ML
> Subject: Re: Latest Plus Kernel include MD RAID-1
> BIO_RW_SYNC patch?
>
> On Fri, 2007-02-23 at 14:01 -0500, Ross S. W. Walker wrote:
> > I am inquiring on the list if anybody knows if the latest
> plus kernel
> > includes the fixes for MD RAID-1 where it didn't pass down the
> > BIO_RW_SYNC flag on cloned bios.
> >
> > This bug was discovered in December by the DRBD project and
> patches were
> > posted by Lars Ellenberg from that project to the LKM which
> were then
> > merged into the 2.6.19 kernel.
> >
> > The bug causes severe performance penalties for
> applications that use
> > the BIO_RW_SYNC flag on block requests.
> >
> > The fix is a simple 2 to 4 line change where it ORs the
> sync flag on the
> > cloned bios.
> >
> > If it isn't in the plus kernel, how would one go about
> putting a request
> > to have it included?
> >
>
> Ross,
>
> We don't normally include external patches in the CentOSPlus
> kernel ...
> just change options in the config file, however since we also
> do support
> DRBD and heartbeat in CentOS Extras I would be willing to try to make
> this happen in the Plus Kernel.
>
> Have you been able to roll this patch in to the current Plus kernel?
I haven't tried yet to tell you the truth. I can give it a shot and if I
get the patch as-is to work I can post it to... Which list should I use
for that, is there a CentOS developers list?
-Ross
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