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From: Jeff Moyer <jmoyer@redhat.com>
To: Corrado Zoccolo <czoccolo@gmail.com>
Cc: "Linux-Kernel" <linux-kernel@vger.kernel.org>,
	Jens Axboe <jens.axboe@oracle.com>,
	Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed
Date: Tue, 08 Dec 2009 13:00:46 -0500	[thread overview]
Message-ID: <x49hbs1fir5.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <4b1a3d84.0d0db80a.39d0.ffff814a@mx.google.com> (Corrado Zoccolo's message of "Fri, 4 Dec 2009 13:35:05 +0100")

Corrado Zoccolo <czoccolo@gmail.com> writes:

> The introduction of ramp-up formula for async queue depths has
> slowed down dirty page reclaim, by reducing async write performance.
> This patch makes sure the formula kicks in only when sync request
> was recently delayed.
> @@ -3706,7 +3707,7 @@ static void *cfq_init_queue(struct request_queue *q)
>  	cfqd->cfq_latency = 1;
>  	cfqd->cfq_group_isolation = 0;
>  	cfqd->hw_tag = -1;
> -	cfqd->last_end_sync_rq = jiffies;
> +	cfqd->last_delayed_sync = jiffies - HZ;

So, umm, what's that about?

Cheers,
Jeff

  parent reply	other threads:[~2009-12-08 18:00 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-04 12:35 Corrado Zoccolo
2009-12-05 11:13 ` Corrado Zoccolo
2009-12-06 10:45   ` Corrado Zoccolo
2009-12-06 10:49     ` Jens Axboe
2009-12-07 14:13       ` Jeff Moyer
2009-12-07 14:41         ` Jens Axboe
2009-12-07 16:45           ` Jeff Moyer
2009-12-07 17:04             ` Vivek Goyal
2009-12-07 17:27             ` Vivek Goyal
2009-12-07 18:03               ` Vivek Goyal
2009-12-08  0:07     ` Jeff Moyer
2009-12-08 20:43       ` Corrado Zoccolo
2009-12-09 18:09         ` Jeff Moyer
2009-12-11 17:15           ` Corrado Zoccolo
2009-12-11 17:50             ` Jeff Moyer
2009-12-18 15:32             ` Jeff Moyer
2009-12-18 21:03               ` Corrado Zoccolo
2009-12-08 18:00 ` Jeff Moyer [this message]
2009-12-08 20:46   ` Corrado Zoccolo
2009-12-09 18:16     ` Jeff Moyer
2009-12-09 19:05       ` Jens Axboe
2009-12-09 19:45 Corrado Zoccolo
2009-12-09 19:51 ` Jeff Moyer
2009-12-09 19:54 ` Jens Axboe

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