From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Fjellstrom Subject: Re: multi-threaded raid5 Date: Mon, 06 Apr 2015 22:34:15 -0600 Message-ID: <1659926.GihAnxuuSt@balsa> References: <551AD6AE.4030607@cra.cz> <20150407111157.2200fb0b@notabene.brown> Reply-To: thomas@fjellstrom.ca Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: <20150407111157.2200fb0b@notabene.brown> Sender: linux-raid-owner@vger.kernel.org To: NeilBrown , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue 07 Apr 2015 11:11:57 AM NeilBrown wrote: > On Tue, 31 Mar 2015 19:17:34 +0200 stkoupr wrote: > > Hi, > > > > We are testing write performance of md raid5 with SSD array and we are > > hitting limit which I understand is caused by writes being handled in > > single thread (md0_raid5 process is eating 100% of 1 CPU core when the > > test is running). I understood that there is some work in progress which > > should make write handling multi-threaded. I'd like to ask about the > > status of this work, is it still in progress or planned? > > > > Regards, > > Prema > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > See /sys/block/mdXXX/md/group_thread_cnt > > Set it to a bigger number, get more threads. > > Requires 3.12 or later. What does it mean when that property is set to 0? > NeilBrown -- Thomas Fjellstrom thomas@fjellstrom.ca