On 15.11.2014 23:35, Garrett Cooper wrote: > On Nov 15, 2014, at 8:04, Ranjan1018 . <21474...@gmail.com> wrote: >> I am running a pair of servers with SSD. In gstat the default >> display of operation/ms is only one digit after the comma and >> there are a lot of R/W operation displayed with the 0.1 value. >> This simple patch displays the operation/ms with two decimal >> digit. >> >> What’s next ? After testing this patch for a day, recording the >> values in a log file, I have found that some write operation are >> only 0.02 ms short, on a OCZ Vertex SSD. Probably the next patch >> is to display micro seconds instead of milli seconds. >> >> Maurizio >> >> FreeBSD 11 gstat.c.patch <http://pastebin.com/B7B8SEy9> > > LGTM, but I don’t have hardware capable of that precision so I > can’t verify the patch other than build test it and run it for what > existing cases I have. > > What do you think Alexander?
SSD in my laptop can to 20K simple case IOPS in one stream, that means ~50us time. So I think this patch should not harm. From the other side these numbers are mostly informational, since any real performance investigation would require a histogram rather the a single average number. -- Alexander Motin _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"