Re: TRIM support

From: Leonidas Spyropoulos <artafinde@gmail.com>
To: "Fajar A. Nugraha" <list@fajar.net>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: TRIM support
Date: Mon, 11 Jul 2011 08:02:43 +0100	[thread overview]
Message-ID: <CAAeznTrou2TOTGtvKDBudQqaTmHjzNoV8AUug3Uw2uUMJJjJVg@mail.gmail.com> (raw)
In-Reply-To: <CAG1y0sf=8PdiXwavma7Vc40td_mpEt+uZJBto+OLW_B+M8QVEQ@mail.gmail.com>

On Mon, Jul 11, 2011 at 7:04 AM, Fajar A. Nugraha <list@fajar.net> wrot=
e:
> On Mon, Jul 11, 2011 at 5:34 AM, Leonidas Spyropoulos
> <artafinde@gmail.com> wrote:
>> So any clues for the intel 320 series? I think it doesn't use compre=
ssion.
>
> At this point your best bet is to try it yourself and see. If it
> doesn't result in poor performance, then keep on using "-o discard".
Could you propose me any tools available for measuring performance?

I only know iozone and tunefs -t parameter.
>
> --
> Fajar
>
>>
>> On Sun, Jul 10, 2011 at 10:59 PM, Fajar A. Nugraha <list@fajar.net> =
wrote:
>>> On Mon, Jul 11, 2011 at 3:58 AM, Leonidas Spyropoulos
>>> <artafinde@gmail.com> wrote:
>>>> On Sun, Jul 10, 2011 at 9:33 AM, Chris Samuel <chris@csamuel.org> =
wrote:
>>>>> On Sun, 3 Jul 2011 05:45:17 AM Calvin Walton wrote:
>>>>> This LWN article from 2009 explains why it can be problematic
>>>>> (especially on SATA drives where TRIM is a non-queued command):
>>>>>
>>>>> https://lwn.net/Articles/347511/
>>>>>
>>>> So the current problem with TRIM in ATA (and SATA) is that it
>>>> introduce delays? As long as it keeps your SSD in a good shape it'=
s
>>>> still better than not having TRIM at all, right?
>>>
>>> Not quite.
>>>
>>> Sandforce-based SSDs have their own way of reducing writes (e.g. by
>>> using internal compression), so you don't have to do anything speci=
al.
>>> Also, AFAIK currently TRIM is useless if the drives are behind a
>>> hardware raid controller anyway.
>>>
>>> My Corsair F60 (on a notebook) is actually MUCH SLOWER with -o disc=
ard
>>> (i.e. writes capped at 100 iops)
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