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From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Sagi Grimberg
	<sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
	Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Bart Van Assche
	<bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>,
	"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re:  RFC: Immediate data support for SRP
Date: Mon, 20 Jul 2015 18:26:53 +0300	[thread overview]
Message-ID: <55AD133D.2040204@mellanox.com> (raw)
In-Reply-To: <55ACC2FA.8030202-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>

On 7/20/2015 12:44 PM, Sagi Grimberg wrote:
> On 7/20/2015 12:43 AM, Or Gerlitz wrote:
>> On Sun, Jul 19, 2015 at 7:07 PM, Sagi Grimberg 
>> <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org> wrote:
>>> On 7/16/2015 6:25 PM, Bart Van Assche wrote:
>>
>>> I agree it would definitely help as the lack of immediate data
>>> emphasizes the additional latency of doing rdma reads.
>>
>> Sagi, do we have black box evidence from iSER showing notable
>> (results? setup?) IO latency improvement from using immediate data vs.
>> RDMA read?
>
> I've seen it. The LIO target has a better write performance due to 
> ImmediateData. 

Numberz, please...

Also, do you see any gain with TGT too? if not, what's you thinking re 
the LIO vs TGT difference?

> I also have a patch in the pipe that optimize the this flow at the 
> target side which improves up to 40% for 512B-8K IOs.
>

So you have 140% better IOPS with immediate-data vs. non immediate 
data?! numberz?

Or.
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  parent reply	other threads:[~2015-07-20 15:26 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-16 15:25 RFC: Immediate data support for SRP Bart Van Assche
     [not found] ` <55A7CCF1.3080201-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2015-07-19 16:07   ` Sagi Grimberg
     [not found]     ` <CACaajQu9QBo7robmrFF7hev-xS=c3VD9qQTn5DKuuObk5aU_Kg@mail.gmail.com>
     [not found]       ` <CACaajQu9QBo7robmrFF7hev-xS=c3VD9qQTn5DKuuObk5aU_Kg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20 23:49         ` Bart Van Assche
     [not found]     ` <55ABCB34.1000506-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-07-19 21:43       ` Or Gerlitz
     [not found]         ` <CAJ3xEMiz=n_uP9TQ6YsGN+omzsN3Zrz5skDEq00+fE188z0erA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-20  9:44           ` Sagi Grimberg
     [not found]             ` <55ACC2FA.8030202-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-07-20 15:26               ` Or Gerlitz [this message]
     [not found]                 ` <55AD133D.2040204-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2015-07-21  9:25                   ` Sagi Grimberg
2015-07-21  0:03       ` Bart Van Assche
     [not found]         ` <55AD8C3A.9070403-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2015-07-21  9:17           ` Sagi Grimberg
     [not found]             ` <55AE0E30.40404-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-07-21 15:35               ` Bart Van Assche

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