From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: Incredibly poor performance of mdraid-1 with 2 SSD Samsung 840 PRO Date: Mon, 22 Apr 2013 18:25:04 -0500 Message-ID: <5175C6D0.3030901@hardwarefreak.com> References: <5171CBF9.9020701@redhost.ro> <51732E2B.6090607@hardwarefreak.com> <5174501F.80509@redhost.ro> <51747382.1010105@hardwarefreak.com> Reply-To: stan@hardwarefreak.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <51747382.1010105@hardwarefreak.com> Sender: linux-raid-owner@vger.kernel.org To: stan@hardwarefreak.com Cc: Andrei Banu , linux-raid@vger.kernel.org List-Id: linux-raid.ids On 4/21/2013 6:17 PM, Stan Hoeppner wrote: > It may not be necessary, at least to solve any SSD performance problems > anyway. Reexamining your numbers shows you hit 262MB/s to /dev/sda. > That's 65% of SATA2 interface bandwidth, so this kernel probably does > have the patch. Your problem lie elsewhere. Big correction. That should state 87% of SATA2 interface bandwidth. I must have been thinking of three things at once when I fubar'd that, as that's not simply a typo. -- Stan