From: Denis Vlasenko <vda@ilport.com.ua>
To: Al Boldi <a1426z@gawab.com>
Cc: Willy Tarreau <willy@w.ods.org>, linux-kernel@vger.kernel.org
Subject: Re: Eradic disk access during reads
Date: Sun, 18 Sep 2005 19:02:17 +0300 [thread overview]
Message-ID: <200509181902.17633.vda@ilport.com.ua> (raw)
In-Reply-To: <200509181640.19984.a1426z@gawab.com>
> > > > # dd if=/dev/hda of=/dev/null bs=16M
> > > 2.4.31 # nmeter t6 c x i b d100
> > > 18:56:36.009981 cpu [SSSSSSSS..] ctx 145 int 86 bio 4.7M 0
> > > 18:56:36.110327 cpu [SSSSSSSS..] ctx 145 int 87 bio 4.8M 0
> > > 18:56:36.210735 cpu [SSSSSSSS..] ctx 139 int 88 bio 4.7M 0
> > > 18:56:36.310315 cpu [SSSSSSSS..] ctx 142 int 85 bio 4.7M 0
> > >
> > > 2.6.13 # nmeter t6 c x i b d100
> > > 18:09:22.117959 cpu [SSSSSSSSSD] ctx 80 int 47 bio 4.7M 0
> > > 18:09:22.217932 cpu [SSSSSSDDDD] ctx 83 int 48 bio 4.8M 0
> > > 18:09:22.319200 cpu [SSSSDDDDDI] ctx 81 int 56 bio 4.7M 28k
> > > 18:09:22.407979 cpu [SSSSSSSSSD] ctx 60 int 38 bio 3.8M 0
> > > 18:09:22.517960 cpu [SSSSSSSSDI] ctx 95 int 61 bio 5.2M 52k
> >
> > Well, I do not see any bursts you mention...
>
> Can you try 2.4.31?
Not easy. I guess I have quite a few 2.6-only things here...
> same here.
>
> > My CPU is not that new:
>
> PII - 400Mhz here.
I meant that kernel seem to eat too much CPU here. This
is not expected. I expected CPU bar to be all D.
> > hdc (an old disk):
> > 13:52:40.201718 cpu [SSSDDDDDDD] ctx 26 int 112 bio 1.2M 0
> > 13:52:40.301569 cpu [SSDDDDDDDD] ctx 28 int 109 bio 1.2M 0
> > 13:52:40.402552 cpu [SSDDDDDDDI] ctx 23 int 111 bio 1.2M 0
> > 13:52:40.502535 cpu [SSDDDDDDDD] ctx 22 int 110 bio 1.2M 0
> > 13:52:40.601507 cpu [SSDDDDDDDI] ctx 26 int 111 bio 1.2M 0
> > 13:52:40.701493 cpu [SSDDDDDDDD] ctx 23 int 110 bio 1.2M 0
>
> Looks smooth.
>
> Also, great meter! Best of all does not hog the CPU!
> Could you add a top3 procs display?
What is a "top3 procs display"?
--
vda
next prev parent reply other threads:[~2005-09-18 16:03 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-17 4:26 Al Boldi
2005-09-17 5:50 ` Willy Tarreau
2005-09-17 10:32 ` Al Boldi
2005-09-17 10:44 ` Denis Vlasenko
2005-09-17 16:38 ` Al Boldi
2005-09-18 11:00 ` Denis Vlasenko
2005-09-18 13:40 ` Al Boldi
2005-09-18 16:02 ` Denis Vlasenko [this message]
2005-09-18 16:34 ` Willy Tarreau
2005-09-18 18:08 ` Al Boldi
2005-09-17 18:46 ` Willy Tarreau
2005-09-18 4:16 ` Al Boldi
2005-09-18 5:23 ` Willy Tarreau
2005-09-18 6:54 ` Al Boldi
2005-09-18 10:40 ` Denis Vlasenko
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