Re: Integration of SCST in the mainstream Linux kernel

Benny Halevy
2008-02-06T16:49:08Z

On Feb. 06, 2008, 14:16 +0200, "Bart Van Assche" <bart.vanassche@gmail.com> wrote:
> On Feb 5, 2008 6:01 PM, Erez Zilber <erezz@voltaire.com> wrote:
>> Using such large values for FirstBurstLength will give you poor
>> performance numbers for WRITE commands (with iSER). FirstBurstLength
>> means how much data should you send as unsolicited data (i.e. without
>> RDMA). It means that your WRITE commands were sent without RDMA.
>
> Sorry, but I'm afraid you got this wrong. When the iSER transport is
> used instead of TCP, all data is sent via RDMA, including unsolicited
> data. If you have look at the iSER implementation in the Linux kernel
> (source files under drivers/infiniband/ulp/iser), you will see that
> all data is transferred via RDMA and not via TCP/IP.

Regardless of what the current implementation is, the behavior you (Bart)
describe seems to disagree with http://www.ietf.org/rfc/rfc5046.txt.

Benny

>
> Bart Van Assche.
> -