From: Jeff Moyer <jmoyer@redhat.com>
To: Mark Lord <kernel@teksavvy.com>
Cc: Joe Ceklosky <jfceklosky@gmail.com>, linux-ide@vger.kernel.org
Subject: Re: SSD slowdown with 3.3.X?
Date: Fri, 20 Apr 2012 11:23:25 -0400 [thread overview]
Message-ID: <x49ehriwhoy.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <4F8F82EC.1060708@teksavvy.com> (Mark Lord's message of "Wed, 18 Apr 2012 23:13:48 -0400")
Mark Lord <kernel@teksavvy.com> writes:
> On 12-04-18 10:15 PM, Joe Ceklosky wrote:
>> All,
>>
>> Has anyone reported slowness using SSD's on kernel 3.3.X compiled
>> as 32-bit PAE with 16 Gigs of memory (I know I need to update to 64-bit
>> already, will do with Fedora 17)?
>>
>> I am see terrible r/w to an SSD using 3.3.2. When I boot the same machine
>> and SSD back in 3.2.15 all is fine.
>
>
> Double check which IO-scheduler the kernel is choosing.
> For SSDs, it is normally "noop", but I noticed "cfq"
> being chosen instead for some reason.
The default I/O scheduler is the default I/O scheduler. Drivers may
override this (some high-end PCIe SSD drivers do this, and I think s390
block drivers do as well), but in general the default is left alone.
Cheers,
Jeff
next prev parent reply other threads:[~2012-04-20 15:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 2:15 SSD slowdown with 3.3.X? Joe Ceklosky
2012-04-19 3:13 ` Mark Lord
2012-04-20 15:23 ` Jeff Moyer [this message]
[not found] ` <4F90C4CF.1010000@gmail.com>
2012-04-21 2:40 ` Mark Lord
2012-04-21 2:43 ` Mark Lord
2012-04-21 3:53 ` Stan Hoeppner
2012-04-21 11:45 ` cwillu
2012-04-21 18:30 ` Stan Hoeppner
2012-04-23 12:44 ` Mark Lord
2012-04-25 0:22 ` Stan Hoeppner
2012-04-23 14:11 ` Jeff Moyer
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