linux-kernel - Re: Integration of SCST in the mainstream Linux kernel

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Date:	Wed, 06 Feb 2008 18:45:47 +0200
From:	Benny Halevy <bhalevy@...asas.com>
To:	Bart Van Assche <bart.vanassche@...il.com>
CC:	Erez Zilber <erezz@...taire.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	rdreier@...co.com, James.Bottomley@...senpartnership.com,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	vst@...b.net, linux-scsi@...r.kernel.org,
	scst-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Integration of SCST in the mainstream Linux kernel

On Feb. 06, 2008, 14:16 +0200, "Bart Van Assche" <bart.vanassche@...il.com> wrote:
> On Feb 5, 2008 6:01 PM, Erez Zilber <erezz@...taire.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.
> -

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