From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: linux-kernel@vger.kernel.org
Cc: Alan Piszcz <ap@solarrain.com>
Subject: 2.6.39.2: discard not supported on mpt2sas
Date: Thu, 14 Jul 2011 17:54:58 -0400 (EDT) [thread overview]
Message-ID: <alpine.DEB.2.02.1107141752580.4904@p34.internal.lan> (raw)
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.
next reply other threads:[~2011-07-14 21:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-14 21:54 Justin Piszcz [this message]
2011-07-15 7:42 ` Justin Piszcz
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