Do you  have NICs  that support  iSCSI -I guess you can use hardware offloading?

MTU size ?
Lattency is usually the killer of any performance, what is your round-trip time 
 ?


Best Regards,
Strahil Nikolov


На 21 юли 2020 г. 2:37:10 GMT+03:00, Philip  Brown <pbr...@medata.com> написа:
>AAAAAH! my apologies. It seemed very odd, so I reviewed, and discovered
>that I messed up my testing of direct lun.
>
>updated results are improved from my previous email, but not any better
>than going through normal storage domain.
>
>18156: 61.714: IO Summary: 110396 ops, 1836.964 ops/s, (921/907 r/w),  
>3.6mb/s,    949us cpu/op,  27.3ms latency
>
>17095: 61.794: IO Summary: 123458 ops, 2052.922 ops/s, (1046/996 r/w), 
> 4.0mb/s,    858us cpu/op,  60.4ms latency
>
>
>
>----- Original Message -----
>From: "Philip Brown" <pbr...@medata.com>
>To: "Paolo Bonzini" <pbonz...@redhat.com>
>Cc: "Nir Soffer" <nsof...@redhat.com>, "users" <users@ovirt.org>,
>"qemu-block" <qemu-bl...@nongnu.org>, "Stefan Hajnoczi"
><stefa...@redhat.com>, "Sergio Lopez Pascual" <s...@redhat.com>,
>"Mordechai Lehrer" <mleh...@redhat.com>
>Sent: Monday, July 20, 2020 4:30:32 PM
>Subject: Re: [ovirt-users] very very bad iscsi performance
>
>FYI, I just tried it with direct lun.
>
>it is as bad or worse.
>I dont know about that sg io vs qemu initiator, but here is the
>results.
>
>
>15223: 62.824: IO Summary: 83751 ops, 1387.166 ops/s, (699/681 r/w),  
>2.7mb/s,    619us cpu/op, 281.4ms latency
>15761: 62.268: IO Summary: 77610 ops, 1287.908 ops/s, (649/632 r/w),  
>2.5mb/s,    686us cpu/op, 283.0ms latency
>16397: 61.812: IO Summary: 94065 ops, 1563.781 ops/s, (806/750 r/w),  
>3.0mb/s,    894us cpu/op, 217.3ms latency
>
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