On Mon, Oct 28, 2013 at 10:45:02AM -0700, aurfalien wrote: > > On Oct 28, 2013, at 2:28 AM, Slawa Olhovchenkov wrote: > > > I can be wrong. > > As I see ZFS cretate seperate thread for earch txg writing. > > Also for writing to L2ARC. > > As result -- up to several thousands threads created and destoyed per > > second. And hundreds thousands page allocations, zeroing, maping > > unmaping and freeing per seconds. Very high overhead. > > > > In systat -vmstat I see totfr up to 600000, prcfr up to 200000. > > > > Estimated overhead -- 30% of system time. > > > > Can anybody implement thread and page pool for txg? > > Would lowering vfs.zfs.txg.timeout be a way to tame or mitigate this? vfs.zfs.txg.timeout: 5 Only x5 lowering (less in real case with burst writing). And more fragmentation on writing and etc.Received on Mon Oct 28 2013 - 17:14:34 UTC
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