[CentOS] Latest Plus Kernel include MD RAID-1 BIO_RW_SYNC patch?

[Ross S. W. Walker]

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Johnny Hughes
> Sent: Friday, February 23, 2007 4:46 PM
> To: CentOS ML
> Subject: Re: [CentOS] 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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