Observation: Setting vm/dirty_background_bytes to 1MB increased my reshape speed by 50% and reduced the resize2fs write interval from once per 5-6 seconds to once per 3-4 seconds. Changing vm/dirty_bytes didn't have any noticeable affect until it got below 50MB at which point performance dropped dramatically. Prior to dialing the knobs, dirty_ratio was 20% and dirty_background_ratio was 10%. The system has 8GB installed. On 3/11/2012 6:29 PM, Asdo wrote: > On 01/08/12 23:03, Larkin Lowrey wrote: >> ... >> Interestingly, to me, when in this state, 'iostat -dx 1' shows the root >> ... > > Do you have any "avgqu-sz" stuck at nonzero value in iostat -dx 1? Yes, avgqu-sz is 1.00. > > > BTW this bug could be related to the recent post by Milan Broz, > subject: "md raid5 fsync deadlock" . > Because also in your case fsyncs are not likely to complete... correct? I do get writes, now about one 4k block every 3-4 seconds. It is quite possible that our two issues are related. --Larkin -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
