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Re: 2.1.121 vs. 2.2.1: inscreased context switching latency according to

To: "Gleb O. Raiko" <raiko@niisi.msk.ru>
Subject: Re: 2.1.121 vs. 2.2.1: inscreased context switching latency according to lmbench
From: Ralf Baechle <ralf@uni-koblenz.de>
Date: Tue, 25 May 1999 11:53:42 +0200
Cc: linux-mips@fnet.fr
In-reply-to: <374906C6.42B88D85@niisi.msk.ru>; from Gleb O. Raiko on Mon, May 24, 1999 at 11:59:02AM +0400
References: <374906C6.42B88D85@niisi.msk.ru>
On Mon, May 24, 1999 at 11:59:02AM +0400, Gleb O. Raiko wrote:

> I've measured 2.2.1 on my Baget (r3k, 25 MHz) by lmbech and see that
> context switching latency was increased. 2.2.1 latency is greater by 2
> times for 2p/0K and almost the same for 16p/16K. The difference
> decreased monotonically, so in the middle, i.e. for 8p/16K the
> difference in 1.5 times greater. I didn't make further investigations
> yet and before I'll do them, I'm very interesting in any suggestions
> and/or experince with other MIPS boxes.

This sounds almost like you experience a reduced cache hit rate.  Maybe
you changed something in the cacheflush routines?

  Ralf

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