From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Fri, 20 Jun 2014 07:45:30 -0400
To: 9fans@9fans.net
Message-ID: <4a81bb5db0670710c6126ad8f7f22d4b@brasstown.quanstro.net>
In-Reply-To: <20140620050945.6C4E7B827@mail.bitblocks.com>
References: <399b6c5c08b7aeab53f52ce0414714bf@brasstown.quanstro.net>
	<20140620050945.6C4E7B827@mail.bitblocks.com>
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Subject: Re: [9fans] cache lines, and 60000 cycles of doom
Topicbox-Message-UUID: fc131b26-ead8-11e9-9d60-3106f5b1d025

> > the astounding thing is that t1-t0 is often ~ 60,000 cycles.
> > it only hits a small fraction of the time, and the average is
> > much lower.  but that just blows the mind.  60000 cycles!
> >
> > (other versions with sched were much worse.)
> >
> > as far as i can tell, there are no funny bits in the scheduler that
> > can cause this, and no wierd scheduling is going on.
> >
> > i'm baffled.
>
> Could there've been a context switch?

the file server does not have context switches.

- erik