Re: Stop SSD from waiting for "Spinning up disk..."

Path	csiph.com!aioe.org!bofh.it!news.nic.it!robomod
From	Martin Steigerwald <martin@lichtvoll.de>
Newsgroups	linux.kernel
Subject	Re: Stop SSD from waiting for "Spinning up disk..."
Date	Thu, 25 Jun 2015 08:10:02 +0200
Message-ID	<pF8wi-eR-7@gated-at.bofh.it> (permalink)
References	<pEB7k-2e9-31@gated-at.bofh.it> <pF2Ke-8e7-1@gated-at.bofh.it> <pF4sF-2mj-7@gated-at.bofh.it>
X-Original-To	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
User-Agent	KMail/4.14.10 (Linux/4.1.0-tp520-btrfstrim-pstatetrace+; KDE/4.14.2; x86_64; git-e0fc73a; 2015-06-16)
MIME-Version	1.0
Content-Transfer-Encoding	7Bit
Content-Type	text/plain; charset="us-ascii"
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	42
Organization	linux.* mail to news gateway
X-Original-Cc	Jeff Chua <jeff.chua.linux@gmail.com>, Andreas Mohr <andi@lisas.de>, lkml <linux-kernel@vger.kernel.org>, Christoph Hellwig <hch@lst.de>
X-Original-Date	Thu, 25 Jun 2015 08:08:50 +0200
X-Original-Message-ID	<2354996.jDU4uRfO83@merkaba>
X-Original-References	<20150623182612.GA27461@rhlx01.hs-esslingen.de> <CAAJw_ZskKJ8JUCs1SUCXszbtqfo=-nEXuXpO=wd_EzC3EhdMfg@mail.gmail.com> <20150625014152.GA9292@kroah.com>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	aioe.org linux.kernel:1171867

Show key headers only | View raw

Am Mittwoch, 24. Juni 2015, 18:41:52 schrieb Greg Kroah-Hartman:
> On Thu, Jun 25, 2015 at 07:55:45AM +0800, Jeff Chua wrote:
> > On Thu, Jun 25, 2015 at 12:28 AM, Greg Kroah-Hartman
> > 
> > <gregkh@linuxfoundation.org> wrote:
> > > On Thu, Jun 25, 2015 at 12:22:47AM +0800, Jeff Chua wrote:
> > >> Both sda and sdb have the same SSD model.
> > > 
> > > That's a bug in your USB bridge chip, odds are it is not reporting the
> > > value properly.  There's nothing the scsi core or USB stack can do
> > > about
> > > this, sorry.  Please complain to the hardware manufacturer.
> > 
> > There are workaround boot cmdline parameters for other things ... any
> > chance to consider  one to fix broken rotational option? I'm not sure
> > how many out there are broken, but I really would like a faster way to
> > access my USB SSD without waiting for the "disk spinup".
> 
> Just like module paramaters, boot command lines are not for device
> specific attributes, sorry.  Again, please contact the manufacturer to
> get this fixed.  We can't add a quirk for this bridge because it would
> not work if you really put a rotational disk behind it.

How about a way to override it in sysfs directly during runtime just for a 
device individually, like choosing an I/O scheduler for example?

> Given the cheap cost of these types of bridges, I recommend just getting
> one that works.

That is an option as well and may educate hardware manufacturers to look a 
bit better at the quality of those devices (at least then Linux market share 
in that market increases).

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Thread

Re: Stop SSD from waiting for "Spinning up disk..." Jeff Chua <jeff.chua.linux@gmail.com> - 2015-06-25 02:00 +0200
  Re: Stop SSD from waiting for "Spinning up disk..." Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2015-06-25 03:50 +0200
    Re: Stop SSD from waiting for "Spinning up disk..." Martin Steigerwald <martin@lichtvoll.de> - 2015-06-25 08:10 +0200
      Re: Stop SSD from waiting for "Spinning up disk..." Jeff Chua <jeff.chua.linux@gmail.com> - 2015-06-25 11:00 +0200

csiph-web