On Tue, Jul 19, 2011 at 1:06 PM, Jörn Engel <joern@xxxxxxxxx> wrote: > On Tue, 19 July 2011 12:41:38 +1000, Dave Chinner wrote: >> On Mon, Jul 18, 2011 at 01:40:36PM +0200, Jörn Engel wrote: >> > On Mon, 18 July 2011 20:57:49 +1000, Dave Chinner wrote: >> > > On Mon, Jul 18, 2011 at 09:53:39AM +0200, Jörn Engel wrote: >> > > > On Mon, 18 July 2011 09:32:52 +1000, Dave Chinner wrote: >> > > > > On Sun, Jul 17, 2011 at 06:05:01PM +0200, Jörn Engel wrote: >> > > >> > > > > > xfs: >> > > > > > ==== >> > > > > > seqrd 1 2 4 8 16 32 64 128 >> > > > > > 16384 4698 4424 4397 4402 4394 4398 4642 4679 >> > > > > > 8192 6234 5827 5797 5801 5795 6114 5793 5812 >> > > > > > 4096 9100 8835 8882 8896 8874 8890 8910 8906 >> > > > > > 2048 14922 14391 14259 14248 14264 14264 14269 14273 >> > > > > > 1024 23853 22690 22329 22362 22338 22277 22240 22301 >> > > > > > 512 37353 33990 33292 33332 33306 33296 33224 33271 >> >> > seqrd 1 2 4 8 16 32 64 128 >> > 16384 4542 8311 15738 28955 38273 36644 38530 38527 >> > 8192 6000 10413 19208 33878 65927 76906 77083 77102 >> > 4096 8931 14971 24794 44223 83512 144867 147581 150702 >> > 2048 14375 23489 34364 56887 103053 192662 307167 309222 >> > 1024 21647 36022 49649 77163 132886 243296 421389 497581 >> > 512 31832 61257 79545 108782 176341 303836 517814 584741 >> >> > What bothers me a bit is that the single-threaded numbers took such a >> > noticeable hit... >> >> Is it reproducable? I did notice quite a bit of run-to-run variation >> in the numbers I ran. For single threaded numbers, they appear to be >> in the order of +/-100 ops @ 16k block size. > > Ime the numbers are stable within about 10%. And given that out of > six measurements every single one is a regression, I would feel > confident to bet a beverage without further measurements. Regression > is 3.4%, 3.9%, 1.9%, 3.8%, 10% and 17% respectively, so the effect > appears to be more visible with smaller block numbers as well. > > Jörn Hi Joern Is the hardware the "Drais card" that you described in the following link www.linux-kongress.org/2010/slides/logfs-engel.pdf Since the driver exposes an mtd device, do you mount the ext4,btrfs filesystem over any FTL? Is it possible to have logfs over the PCIe-SSD card? Pardon me for asking the following in this thread. I have been trying to mount logfs and i face seg fault during unmount . I have tested it in 2.6.34 and 2.39.1. I have asked about the problem here. http://comments.gmane.org/gmane.linux.file-systems/55008 Two other people have also faced umount problem in logfs 1. http://comments.gmane.org/gmane.linux.file-systems/46630 2. http://eeek.borgchat.net/lists/linux-embedded/msg02970.html My apologies again for asking it here. Since the logfs@xxxxxxxxx mailing list(and the wiki) doesnt work any more , i am asking the question here. I am thankful for your reply. Thanks, mugunthan -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
