From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brad Campbell Subject: Re: some general questions on RAID Date: Fri, 05 Jul 2013 11:06:43 +0800 Message-ID: <51D63843.50306@fnarfbargle.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Sam Bingner Cc: Christoph Anton Mitterer , "linux-raid@vger.kernel.org" List-Id: linux-raid.ids On 05/07/13 09:39, Sam Bingner wrote: > On 7/4/13 3:13 PM, "Brad Campbell" wrote: > >> On 05/07/13 02:30, Christoph Anton Mitterer wrote: >> When I say max out, I run into bandwidth limits on the hardware before >> dmcrypt gets in the way. >> > > That is because your CPU has encryption features - the QNAP devices > largely do not; I replaced the CPU in mine with one that had encryption > features because otherwise there was nothing that could bring the > performance above about 80MB/sec > > > Once I put in a CPU supporting AESNI I could get up to about 500MB/sec - > and this was still not CPU bound Yes, of course. I forgot about the dedicated storage device rather than a general server. I run dmcrypt on a WD mybook live and get about 8MB/s on that (which is enough for what I need).