* dm-thin COMMIT_PERIOD problem @ 2014-11-01 14:40 lilofile 2014-11-01 18:45 ` Mike Snitzer 0 siblings, 1 reply; 2+ messages in thread From: lilofile @ 2014-11-01 14:40 UTC (permalink / raw) To: dm-devel In dm-thin.c,COMMIT_PERIOD is set HZ, I think this value has a impact on system impact,too frequent commit will reduce the write performance of the system？ other method which it is submitted by the total size of dirty data is feasible？ -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: dm-thin COMMIT_PERIOD problem 2014-11-01 14:40 dm-thin COMMIT_PERIOD problem lilofile @ 2014-11-01 18:45 ` Mike Snitzer 0 siblings, 0 replies; 2+ messages in thread From: Mike Snitzer @ 2014-11-01 18:45 UTC (permalink / raw) To: lilofile; +Cc: dm-devel On Sat, Nov 01 2014 at 10:40am -0400, lilofile <lilofile@aliyun.com> wrote: > In dm-thin.c,COMMIT_PERIOD is set HZ, I think this value has a impact on system impact,too frequent commit will reduce the write performance of the system？ > other method which it is submitted by the total size of dirty data is feasible？ It only issues IO if changes have occured. It isn't writing to disk every second unless changes need to get to disk anyway. (There was a bug where it _did_ write the metadata superblock every second even when it wasn't needed.. since fixed with this commit: http://git.kernel.org/linus/4d1662a30 ) -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel ^ permalink raw reply [flat|nested] 2+ messages in thread
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