linux-kernel - Re: 2.6.39.2: discard not supported on mpt2sas

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Date:	Fri, 15 Jul 2011 03:42:01 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org
cc:	Alan Piszcz <ap@...arrain.com>
Subject: Re: 2.6.39.2: discard not supported on mpt2sas


On Thu, 14 Jul 2011, Justin Piszcz wrote:

> Hi,
>
> Something interesting to note:
>
> When I have an Intel 510 SSD plugged into an mpt2sas board, discard (TRIM) is 
> not supported:
>
> [   16.483409] EXT4-fs (sda2): re-mounted. Opts: discard
> [   17.814743] EXT4-fs warning (device sda2): release_blocks_on_commit:2679: 
> discard not supported, disabling
>
> With a regular SATA port or an (PCI-e 2.0 x1 card), it works but with the 
> overhead, PCI-e x1 seems to peak around 400-430MiB/s for reads, whereas with 
> an X8 SAS controller I see 480-495MiB/s as the benchmarks show on various 
> websites, ah well, its one thing or the other.
>
> Justin.
>

Hi,

Is there anyway to allow pass through for TRIM via mp2sas or is it 
strictly for SATA controllers only?

Justin.


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