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?
Thanks,
Ross S. W. Walker Information Systems Manager Medallion Financial, Corp. 437 Madison Avenue 38th Floor New York, NY 10022 Tel: (212) 328-2165 Fax: (212) 328-2125 WWW: http://www.medallion.com http://www.medallion.com
______________________________________________________________________ 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.