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
next prev 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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