Date: Wed, 10 Aug 2016 15:27:15 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: [iSCSI] Trying to reach max disk throughput Message-ID: <7CE3E62B-8251-4390-BD90-CF2F76F57CA7@gmail.com> In-Reply-To: <20160810114404.GA80485@brick> References: <6B32251D-49B4-4E61-A5E8-08013B15C82B@gmail.com> <20160810114404.GA80485@brick>
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> On 10 Aug 2016, at 13:44, Edward Tomasz Napierała <trasz@FreeBSD.org> wrote: > > On 0810T1154, Ben RUBSON wrote: >> Hello, >> >> I'm facing something strange with iSCSI, I can't manage to reach the expected disk throughput using one (read or write) thread. > > [..] > >> ### Initiator : iscsi disk throughput : >> >> ## dd if=/dev/da8 of=/dev/null bs=$((128*1024)) count=81920 >> 10737418240 bytes transferred in 34.731815 secs (309152234 bytes/sec) - 295MB/s >> >> With 2 parallel dd jobs : 345MB/s >> With 4 parallel dd jobs : 502MB/s >> >> >> >> ### Questions : >> >> Why such a difference ? >> Where are the 167MB/s (462-295) lost ? > > Network delays, I suppose. I just saw that iSER is available in FreeBSD 11, let's install BETA4 and give it a try.
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