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From: Anton Blanchard <anton@samba.org>
To: Nick Piggin <npiggin@suse.de>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 6/6] powerpc: Use lwsync for acquire barrier if CPU supports it
Date: Wed, 17 Feb 2010 20:43:14 +1100	[thread overview]
Message-ID: <20100217094314.GC24270@kryten> (raw)
In-Reply-To: <20100211070914.GB6735@laptop>

 
Hi Nick,

> Ah, good to see this one come back. I also tested tbench over localhost
> btw which actually did show some speedup on the G5. 
> 
> BTW. this was the last thing left:
> http://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg29738.html
> 
> Don't know if you took a look at that again, but maybe it's worth
> looking at. Hmm, we do actually seem to be growing number of smp_mb*
> calls in core kernel too.

Interesting idea! I do worry we will get a late night visit from the
architecture police. From memory they want the complete larx, stcwx, bne,
isync sequence to guarantee an acquire barrier.

Anton

  reply	other threads:[~2010-02-17  9:43 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-10 10:57 [PATCH 1/6] powerpc: Use lwarx hint in spinlocks Anton Blanchard
2010-02-10 11:02 ` [PATCH 2/6] powerpc: Use lwarx/ldarx hint in bit locks Anton Blanchard
2010-02-10 11:03   ` [PATCH 3/6] powerpc: Convert open coded native hashtable bit lock Anton Blanchard
2010-02-10 11:04     ` [PATCH 4/6] powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER Anton Blanchard
2010-02-10 11:07       ` [PATCH 5/6] powerpc: Fix lwsync patching code on 64bit Anton Blanchard
2010-02-10 11:10         ` [PATCH 6/6] powerpc: Use lwsync for acquire barrier if CPU supports it Anton Blanchard
2010-02-11  7:09           ` Nick Piggin
2010-02-17  9:43             ` Anton Blanchard [this message]
2010-02-17 10:41               ` Nick Piggin
2010-02-17 12:12                 ` Benjamin Herrenschmidt
2010-02-16  4:22           ` Olof Johansson
2010-02-16  4:19             ` Benjamin Herrenschmidt
2010-02-16  6:07               ` Olof Johansson
2010-03-19  1:08       ` [PATCH 4/6] powerpc: Rename LWSYNC_ON_SMP to PPC_RELEASE_BARRIER, ISYNC_ON_SMP to PPC_ACQUIRE_BARRIER Nick Piggin
2010-03-19  1:36         ` Benjamin Herrenschmidt
2010-02-11  6:56 ` [PATCH 1/6] powerpc: Use lwarx hint in spinlocks Nick Piggin
2010-02-17  9:37   ` Anton Blanchard
2010-02-17 10:22     ` Nick Piggin
2010-02-16  4:16 ` Olof Johansson

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