[linux-lvm] LVM and *bad* performance (no striping)
Patrick Caulfield
caulfield at sistina.com
Tue May 15 12:13:57 UTC 2001
On Tue, May 15, 2001 at 01:46:15PM +0200, Urs Thuermann wrote:
>
> And am I really the only one who sees this? I would really be
> interested to hear from some more people about performance for their
> LVM.
I think one problem is that your "benchmarks" are not very realistic. In
real world use the overhead of LVM is very small. I would respectfully suggest
that you try something like bonnie++ before getting too worried about the
performance of LVM on your machine - unless you spend most of your day doing
"dd" to your disks :-)
Here are some bonnie++ benchmarks of a disk partition and and LV (same disk)
using reiserfs* on my machine:
Disk Partition:
Version 1.00g ------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
tyke 496M 10462 98 20675 53 7699 20 11707 96 17808 16 257.0 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 8426 100 +++++ +++ 12622 100 8031 100 +++++ +++ 9635 100
Logical Volume:
Version 1.00g ------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
tyke 496M 10577 100 20631 52 7739 20 11676 96 17622 17 260.7 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 8521 100 +++++ +++ 12661 99 8007 100 +++++ +++ 9555 99
patrick
* ext2 is comparable, just the numbers are different.
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