From: "Henric Andersson" <ha@thedudes.nu>
To: herbert@13thfloor.at
Cc: linux-lvm@sistina.com
Subject: Re: [linux-lvm] Poor performance with LVM 1.0.7
Date: Wed Aug 27 07:59:06 2003 [thread overview]
Message-ID: <001001c36c93$9336a490$c5000a0a@TTHENRIC2> (raw)
In-Reply-To: 20030827115857.GE23955@www.13thfloor.at
> check the raw performance of one drive involved
> with hdparm -tT ...
Did that, it reported between 27-45MB/s on all drives (ranging from the system harddrive to the LVM
harddrives)
> > After scouring the net for suggestions on how to improve the speed, I came
> > up empty, and thus, I'm writing this email :)
> >
> > Some more facts (more available if needed ;)) about the server:
> >
> > All drives are tuned with 32bit transfers and DMA enabled. I'm running
> > kernel 2.4.22pre2 (gentoo).
>
> just for the fun of doing it, compile vanilla
> 2.4.22 and give it a try ... you could also add
Oki, will try it as soon as I get home.
> the following lvm patch ...
> http://www.13thfloor.at/VServer/patches-2.4.22-p10c17/07_lvm-1.0.7-2.4.21pre5.patch.bz2
Hmm? What does this patch do?
> was the performance you had on your old box higher?
> or did you just expect an increase in speed, which didn't
> happen?
Performance on my old box was lower, so I expected it to increase with my new system. And it did, as
long as I don't serve any files from the volumeset, everything runs just fine (9.5MB/s) but whenever I
try to access files on the LV, I get 4-5MB/s ...
Even tried doing:
time cat "somefile on the LV set" > /dev/null
Which performed equally bad (ie, about 4-5MB/s). Doing the same on the /dev/hda1 drive gives ALOT
better performance (more in the line of what hdparm -Tt reports)
/Henric
next prev parent reply other threads:[~2003-08-27 7:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-26 12:47 [linux-lvm] Poor performance with LVM 1.0.7 Henric Andersson
2003-08-27 7:00 ` Herbert Pötzl
2003-08-27 7:59 ` Henric Andersson [this message]
2003-08-27 7:59 ` Herbert Pötzl
2003-08-27 10:58 ` Henric Andersson
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