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From: Tejun Heo <htejun@gmail.com>
To: Jens Axboe <axboe@suse.de>
Cc: Robert Hancock <hancockr@shaw.ca>,
	Bill Davidsen <davidsen@tmr.com>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [git patch] libata resume fix
Date: Tue, 06 Jun 2006 16:10:11 +0900	[thread overview]
Message-ID: <44852A53.6050204@gmail.com> (raw)
In-Reply-To: <20060606070539.GO4400@suse.de>

Jens Axboe wrote:
>> Can you measure spin up time for your 15k's?  Some controllers can't 
>> catch the first D2H FIS after POR and have to wait unconditionally for 
>> spin up for hotplug & resuming from suspend.  Currently 8 sec wait is 
>> used but it seems insufficient for your drives.  Failing to spinup in 
>> that 8 secs would probably result in timeout of the first reset attempt 
>> and retrial - which currently takes > 30 secs.
>>
>> Spin-up time can be measured by first issuing STANDBY and then time how 
>> long IDLE IMMEDIATE takes, I think.
> 
> The 15K RPM is a SCSI drive, I haven't seen any SATA 15K rpm drives yet.
> I have the same model in another box, I can measure spinup with
> START_STOP unit there. I will do so later today, when I fire it up, if
> you still want to know?
> 

Arggh.. Confused w/ 10k drives.  But it would be nice to know spin-up 
time for 15k's if it doesn't waste too much of your time.

Thanks.

-- 
tejun

  reply	other threads:[~2006-06-06  7:10 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <6hAdo-5CV-5@gated-at.bofh.it>
     [not found] ` <6hXD0-6Y9-1@gated-at.bofh.it>
     [not found]   ` <6icsx-4vp-33@gated-at.bofh.it>
     [not found]     ` <6ih8Y-3ba-15@gated-at.bofh.it>
     [not found]       ` <6iH3h-2xw-59@gated-at.bofh.it>
2006-06-01  3:27         ` [git patch] libata resume fix Robert Hancock
2006-06-01 13:48           ` Jens Axboe
2006-06-01 14:20             ` Bill Davidsen
2006-06-06  6:54             ` Tejun Heo
2006-06-06  7:05               ` Jens Axboe
2006-06-06  7:10                 ` Tejun Heo [this message]
2006-05-28 20:34 Jeff Garzik
2006-05-29 21:34 ` Benjamin Herrenschmidt
2006-05-30 13:22   ` Mark Lord
2006-05-30 18:26     ` Linus Torvalds
2006-05-30 18:40       ` Ric Wheeler
2006-05-30 22:37       ` Benjamin Herrenschmidt
2006-05-31  6:47         ` Jens Axboe
2006-05-31  6:56           ` Benjamin Herrenschmidt
2006-05-31 22:01       ` Bill Davidsen
2006-05-30 22:34     ` Benjamin Herrenschmidt

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