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

[Johnny Hughes]

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?

Thanks,
Johnny Hughes


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