Date: Tue, 20 Nov 2012 16:45:59 +0100 From: =?ISO-8859-1?Q?Peter_Ankerst=E5l?= <peter@pean.org> To: freebsd-stable@freebsd.org Subject: Re: Poor iSCSI performance with istgt. Message-ID: <50ABA5B7.80500@pean.org> In-Reply-To: <E1TaSuu-0007V2-TQ@kabab.cs.huji.ac.il> References: <E1TaRi4-0006IH-8u@kabab.cs.huji.ac.il> <50AA3FCD.7030808@pean.org> <E1TaSuu-0007V2-TQ@kabab.cs.huji.ac.il>
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On 11/19/2012 04:05 PM, Daniel Braniss wrote: >> >> On 11/19/2012 02:48 PM, Daniel Braniss wrote: >>> try increasing the tag opening - see camcontrol(8) >>> >>> danny >>> >>> >>> >> I tried camcontrol tags daX -N 32 (and a few different values) but cant >> see any change in speeds. >> >> (pass25:iscsi0:0:0:0): dev_openings 30 >> (pass25:iscsi0:0:0:0): dev_active 2 >> (pass25:iscsi0:0:0:0): devq_openings 30 >> (pass25:iscsi0:0:0:0): devq_queued 0 >> (pass25:iscsi0:0:0:0): held 0 >> (pass25:iscsi0:0:0:0): mintags 2 >> (pass25:iscsi0:0:0:0): maxtags 255 > > I think there is some magic to allow istgt to do tagging, but at the moment > can't find it, sorry. Hm! When increasing the tag openings to 8 (for example) I get extremley good reads. I saturate the network (arount 550MB/s). But writes becomes even more slow (around 1-2MB/s). So it seems the iscsi setup is capable of hadling the speeds I want but for some reason writes are f*ed up.
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