Subject: Re: Extremely slow IO response times + panic on 3.0_BETA
To: Valtteri Vuorikoski <email@example.com>
From: Dan LaBell <firstname.lastname@example.org>
Date: 07/13/2005 19:45:27
On Jul 13, 2005, at 6:11 PM, Valtteri Vuorikoski wrote:
> email@example.com (Michael van Elst) writes:
>> firstname.lastname@example.org (Valtteri Vuorikoski) writes:
>>> I've been running 3.0_BETA CVS'd Jun 30 on a P4 box with two PATA
>>> mirrored with raidframe. When doing disk io that involves heavy
>>> operations, (ie. tar xzf pkgsrc.tar.gz) sometimes disk IO response
>>> extremely slow. It may take several minutes to do ls -l /usr/bin and
>>> another 30 seconds to get the prompt back once the listing is
>> Yes, that's normal. The disks are almost only writing and there is
>> no memory for the filecache. But this was already the case for 2.0.
> I don't remember the effect being quite as severe on 2.0; maybe I just
> haven't tried the quite the same things.
> While I can see the mechanism behind it, the near-complete-hanging of
> the system is not a very pleasant experience.
I recently experienced something like this, but w/o any metadata
operations, just dd on the
I just got a 149 GB drive , it's destined to replace a 80 gig in a fw
but I decided to test it out on my pc first. It seemed completely
zeroed (fresh) , but
to verify that ,and to do a read-test, I did a: dd if=/dev/rwd1d
bs=128k | sum
Afterwards, there would be about a 3 second window, where I could type,
maybe switch vt's,
but, then a long hang, which seemed last around a minute, possibly
longer, before any kind of responsiveness was returned. I'm wondering
if the affect could be tuned away?
( I'm running 2.0.2 )