On 09/10/2013 11:57 AM, Vineet Gupta wrote: > On 09/05/2013 11:55 PM, David Miller wrote: >> From: Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx> >> Date: Wed, 4 Sep 2013 17:17:15 +0530 >> >>> copying large files to a NFS mounted host was taking absurdly large >>> time. >>> >>> Turns out that TX BD reclaim had a sublte bug. >>> >>> Loop starts off from @txbd_dirty cursor and stops when it hits a BD >>> still in use by controller. However when it stops it needs to keep the >>> cursor at that very BD to resume scanning in next iteration. However it >>> was erroneously incrementing the cursor, causing the next scan(s) to >>> fail too, unless the BD chain was completely drained out. >>> >>> [ARCLinux]$ ls -l -sh /disk/log.txt >>> 17976 -rw-r--r-- 1 root root 17.5M Sep /disk/log.txt >>> >>> ========== Before ===================== >>> [ARCLinux]$ time cp /disk/log.txt /mnt/. >>> real 31m 7.95s >>> user 0m 0.00s >>> sys 0m 0.10s >>> >>> ========== After ===================== >>> [ARCLinux]$ time cp /disk/log.txt /mnt/. >>> real 0m 24.33s >>> user 0m 0.00s >>> sys 0m 0.19s >>> >>> Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx> >> >> Applied. >> > > Hi Greg, > > This needs a stable backport (3.11). > Mainline commit 27082ee1b92f4d41e78b85 > > Thx, > -Vineet Hi Greg, I didn't spot this one in your stable-queue for 3.11. Please apply. Thx, Vineet -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html