> -----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 ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.