linux-kernel - Re: [rfc][patch] store-free path walking

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Date:	Mon, 12 Oct 2009 13:00:45 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	samba-technical@...ts.samba.org
Subject: Re: [rfc][patch] store-free path walking

On Mon, Oct 12 2009, Jens Axboe wrote:
> > Anyway, if you do get a chance to run dbench with this
> > modification, I would appreciate seeing a profile with clal
> > traces (my bigger system is ia64 which doesn't do perf yet).
> 
> For what number of clients?

Attached are call graphs for 8 and 32 clients, with your latest patch
applied. At 8 clients, we're already at 80% spinlock time. While running
the 32 client record, I wanted to open a file in the tmpfs mount where
dbench was running. bash was spinning until dbench completed.

At 32 clients, throughput is 75% of the 8 client case. And spinlock time
there is at 90%.

I have attached both outputs.

-- 
Jens Axboe

Download attachment "8client.txt.bz2" of type "application/octet-stream" (53343 bytes)

Download attachment "32client.txt.bz2" of type "application/octet-stream" (65409 bytes)