On Wed, Apr 30, 2014 at 01:51:14PM +0200, Daniel Smedegaard Buus wrote: > Hi :) > > What's the state of this? > > I have this issue on a number of EC2 instances that are using bcache > to speed up EBS access by caching on the ephemeral SSDs (writethrough > mode). > > "echo 0 > /sys/block/bcache0/bcache/writeback_running" as suggested by > others stops the flood of "blocked" messages in dmesg, but it only > partly fixes the 2.0 minimum load average issue (instead, it's now a > 1.0 minimum load average).
I haven't spent time on figuring out the other source of load average. Kent didn't seem to like the patch to convert the bcache_writeback thread to interruptible sleep (I recall he said it was 'wrong', but didn't elaborate). --D > > I just tried the latest kernel I could get my hands on for Ubuntu > Trusty, the mainline v3.15-rc2 (built April 20th), and it exhibits the > same behavior. > > Thanks :) > > Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
