From: Nick Piggin <npiggin@suse.de>
To: Anton Blanchard <anton@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH 1/6] powerpc: Use lwarx hint in spinlocks
Date: Wed, 17 Feb 2010 21:22:15 +1100 [thread overview]
Message-ID: <20100217102215.GR5723@laptop> (raw)
In-Reply-To: <20100217093714.GB24270@kryten>
On Wed, Feb 17, 2010 at 08:37:14PM +1100, Anton Blanchard wrote:
>
> Hi Nick,
>
> > Cool. How does it go when there are significant amount of instructions
> > between the lock and the unlock? A real(ish) workload, like dbench on
> > ramdisk (which should hit the dcache lock).
>
> Good question, I'll see if we can see a difference on dbench.
Well I misread your benchmark. Your test is using pthread mutexes in
order to basically exercise kernel's syscall and context switching and
futex code. Wheras I thought it was just a trivial lock/unlock
sequence being tested.
So I'm much more impressed with your numbers :) dbench would still
be interesting though.
next prev parent reply other threads:[~2010-02-17 10:22 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
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 [this message]
2010-02-16 4:16 ` Olof Johansson
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