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From: Dan Malek <dan@embeddededge.com>
To: <Joakim.Tjernlund@lumentis.se>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: [26-devel] v2.6 performance slowdown on MPC8xx: Measuring TLB cache misses
Date: Sat, 7 May 2005 16:24:01 -0400	[thread overview]
Message-ID: <779d257b5aa25f341bc452dabf5987c4@embeddededge.com> (raw)
In-Reply-To: <BCEFJBPJCGFCNMMMIDBHGEJMCLAA.Joakim.Tjernlund@lumentis.se>


On May 7, 2005, at 2:10 PM, Joakim Tjernlund wrote:

> Not completly sure that this is correct. There are a few:
> 	addi	r10, r10, 0x0100
>  	mtspr	SPRN_MD_CTR, r10
> later on which will "overflow" 0x1f00 into 0x2000 etc.

Oh right, I forgot I did that.  I explicitly set the tlb index before
each write.  Sorry, I thought it was due to more bits of index
in the 885.

So, I guess what was there should have worked.

OK, so the reason TLB pinning doesn't work is a tlbie() can
evict the pinned entry.  That stupid code in the cpm reset
will throw them out, plus anything else that would do a
tlbie() of a kernel address within the pinned space (like
the update_mmu_cache() hack).  We have to fix those,
and look for any others where that may happen.

Thanks.


	-- Dan

  parent reply	other threads:[~2005-05-07 20:24 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-04-23 17:23 [26-devel] v2.6 performance slowdown on MPC8xx: Measuring TLB cache misses Joakim Tjernlund
2005-04-23 12:42 ` Marcelo Tosatti
2005-04-23 21:31   ` Joakim Tjernlund
2005-04-23 21:32   ` Dan Malek
2005-04-23 21:55     ` Joakim Tjernlund
2005-04-23 22:12       ` Dan Malek
2005-04-23 17:35 ` Joakim Tjernlund
2005-04-23 21:29   ` Dan Malek
2005-04-23 21:51     ` Joakim Tjernlund
2005-04-23 22:09       ` Dan Malek
2005-04-23 23:12 ` Dan Malek
2005-04-23 23:51   ` Joakim Tjernlund
2005-04-24  0:00     ` Dan Malek
2005-04-24 16:55       ` Marcelo Tosatti
2005-04-25  9:57         ` Joakim Tjernlund
2005-05-07 18:10         ` Joakim Tjernlund
2005-05-07 14:42           ` Marcelo Tosatti
2005-05-07 20:24           ` Dan Malek [this message]
  -- strict thread matches above, loose matches on Subject: below --
2005-04-21 18:32 Marcelo Tosatti
2005-04-21 18:50 ` [26-devel] " Marcelo Tosatti
2005-04-22  6:18   ` Pantelis Antoniou
2005-04-22 15:39     ` Marcelo Tosatti

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