All of lore.kernel.org
 help / color / mirror / Atom feed
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.

  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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20100217102215.GR5723@laptop \
    --to=npiggin@suse.de \
    --cc=anton@samba.org \
    --cc=linuxppc-dev@ozlabs.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.