Date: Fri, 10 Jun 2005 12:09:10 -0300 (EST) From: <scuba@centroin.com.br> To: Glenn Dawson <glenn@antimatter.net> Cc: freebsd-performance@freebsd.org Subject: Re: vn(4) performance on 4.11 versus md(4) on 5.4 Message-ID: <Pine.BSI.4.33.0506101157550.11087-100000@hypselo.centroin.com.br> In-Reply-To: <6.1.0.6.2.20050604230636.01bf68c0@cobalt.antimatter.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi Glenn, =09Have already fixed that problem? =09Your tests were on the same hardware? =09I=B4ve tested two of my boxes one with, FBSD 4.9 and another with the latest cvs 5.4. =09They=B4re not the same hardware but the performance with md drive was MUCH faster with 5.4. =09TEsted with 'dd': =094.9: dd if=3D/dev/zero of=3DTESTE count=3D1000 bs=3D64k 1000+0 records in 1000+0 records out 65536000 bytes transferred in 1.005721 secs (65163195 bytes/sec) =095.4: dd if=3D/dev/zero of=3DTESTE count=3D1000 bs=3D64k 1000+0 records in 1000+0 records out 65536000 bytes transferred in 0.241217 secs (271688824 bytes/sec) - Marcelo Souza On Sat, 4 Jun 2005, Glenn Dawson wrote: | | | |I have a number of systems running 4.11 that have file backed virtual |disks, each of which contains a jail. I need to start using 5.4 for new |servers. The catch is, file backed virtual disks using md(4) seem to be |much slower than similar virtual disks on 4.11 using vn(4). vn(4) on 4.11 |is about 2.24 times faster than the equivalent setup using md(4) on 5.4. | |I've posted the results of some tests that I ran at |http://www.antimatter.net/md-versus-vn.txt | |Is this decrease in performance known? Is there something I can do in |order to come close to the performance that 4.11 has? I've tried changing |some of the parameters of the filesystem on the virtual disk, but the |performance didn't change. | |I can supply more info than what the link above has, if needed. |If I should post this to another list please let me know. (I started here |in order to avoid cross posting. | |-Glenn | |_______________________________________________ |freebsd-performance@freebsd.org mailing list |http://lists.freebsd.org/mailman/listinfo/freebsd-performance |To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.= org" | - Marcelo
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSI.4.33.0506101157550.11087-100000>