[linux-lvm] Performance problem.
neuron
neuron at hollowtube.mine.nu
Mon Nov 17 12:15:01 UTC 2003
> Actually. SMB never gives optimal transfer speeds. On a HUB you
> can expect not much more than 6-7MB/S on a 100mbit connection.
> With a Switch you can get higher, up to 12.5MB/s over FTP (but
> never with SMB due to protocol overhead etc).
yeah, I thought it was smb at first aswell, but I get the exact same speed over ftp. And rm'ing a file (on ssh to the server) and playing a mp3 at the same time shouldn't make the mp3 skip 1-3 seconds should it?
And I've had a stable 11mb/sec out of smb before (tweaked).
> Also there is this tool called elvtune. It allowes you to "tune the I/O
> elevator per blockdevice queue basis". See the man pages.
>
> You could try to lower the read latency for the affected devices (/dev/hda,
> /dev/hdb, etc.)
elvtune shows read_latency of 2048 and write_latency of 8192, that's already quite low isn't it? If not, have any example values I can test with?
cat .config | grep -i tcq shows
# CONFIG_BLK_DEV_IDE_TCQ is not set
should I manually set it and compile? It's not in make_config.
also does anyone have a lvmcreate_initrd script for lvm2?
just did a bonnie++ test on the lvm volume. Seems VERY slow doesen't it.
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
hollowtube 1G 3787 93 26948 62 10841 14 5885 90 21274 17 175.3 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 4991 98 +++++ +++ 4135 90 4613 91 +++++ +++ 3912 89
hollowtube,1G,3787,93,26948,62,10841,14,5885,90,21274,17,175.3,1,16,4991,98,+++++,+++,4135,90,4613,91,+++++,+++,3912,89
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