Re: anticipatory scheduling questions

Andrew Morton (
Sun, 2 Mar 2003 12:43:58 -0800

"Felipe Alfaro Solana" <> wrote:
> > You have not actually said whether 2.5.63 base exhibits
> > the same problem. From the vmstat traces it appears
> > that the answer is "yes"?
> Both 2.5.63 and 2.5.63-mm1 exhibit this behavior, but
> can't be reproduced with 2.4.20-2.54.

By 2.54 I assume you mean 2.5.54?

> > > I have retested this with 2.4.20-2.54, 2.5.63 and 2.5.63-mm1...
> > > and have attached the files to this message
> >
> > Thanks. Note how 2.4 is consuming a few percent CPU, whereas 2.5 is
> > consuming 100%. Approximately half of it system time.
> It seems is not "user" or "system" time what's being consumed, it's
> "iowait" Look below :-)

Your vmstat traces were showing tons of user time as well as system
time. Please make sure that you have the latest version of procps,
from or

> > It does appear that some change in 2.5 has caused evolution to go berserk
> > during this operation.
> I wouldn't say it's exactly Evolution what's going berserk. Doing a
> "top -s1" while trying to reply to a big e-mail message, I've noticed
> that "top" reports "iowait" starting at ~50%, then going up very fast
> and then staying up at 90-95% all the time. This happens on 2.5.63
> and 2.5.63-mm1, however, on 2.4.20-2.54 kernel, "iowait" stays all
> the time exactly at "0%" and idle time remains steady at 90-95%.

Well certainly the IO stream _looks_ like it is stuck in IO-wait a lot.

It is strange that this has been happening for a couple of months and seems
to only affect Felipe Solana's copy of evolution. I still can't get my copy
to spellcheck a thing. I need to wrestle with it a bit more.

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