Hi, Pasi,

Here are some throughput numbers we see with disktest, one tcp connection 
(iscsi session).

The setup are between a pair of chelsio 10G adapters. The target is Chelsio's 
ramdisk target with data discarded (similiar to IET's NULLIO mode). The Chelsio 
target is used because of the digest offload and payload ddp. 

The ethernet frame is standard 1500 bytes.

The numbers are about 3 months old, but you get the idea :) For cxgb3i driver, 
since the digest is offloaded the performance is very similar in the digest off 
case, so only the numbers for digest on are shown.

We will re-run the tests and get the cpu stats too, will keep you posted.


Test         cxgb3i         iscsi-tcp         iscsi-tcp
             digest on      digest on         digest off
             (MB/sec)       (MB/sec)          (MB/sec)
=======================================================

512-read     36.85           34.13            36.69
1k-read      71.91           58.52            66.81
2k-read      137.24          97.75            128.46
4k-read      280.61         137.98            214.04
8k-read      531.34         201.87            325.09
16k-read     953.67         226.49            429.32
64k-read     1099.57        248.57            626.30
128k-read    1102.65        256.04            613.94
256k-read    1105.28        262.28            642.73
 
512-write    39.54           34.18             38.36
1k-write     79.52           56.51             75.06
2k-write     158.03          84.12            140.85
4k-write     314.56         126.33            282.72
8k-write     559.83         155.49            528.24
16k-write    968.84         168.50            676.38
64k-write    1099.31        182.82            978.82
128k-write   1074.62        182.55            974.18
256k-write   1063.85        185.67            972.88


-----Original Message-----
From: Pasi Kärkkäinen [mailto:pa...@iki.fi] 
Sent: Monday, December 15, 2008 6:06 AM
To: open-iscsi@googlegroups.com
Cc: linux-s...@vger.kernel.org; micha...@cs.wisc.edu; 
james.bottom...@hansenpartnership.com; Karen Xie
Subject: Re: [PATCH v2 0/2 2.6.29] cxgb3i -- open-iscsi initiator acceleration

On Tue, Dec 09, 2008 at 02:15:22PM -0800, Karen Xie wrote:
> 
> [PATCH v2 0/2 2.6.29] cxgb3i -- open-iscsi initiator acceleration 
> 
> From: Karen Xie <k...@chelsio.com>
> 
> Here is the updated patchset for adding cxgb3i iscsi initiator.
> 
> The updated version incorporates the comments from Mike and Boaz:
> - remove the cxgb3 sysfs entry for the private iscsi ip address, it can be
>   accessed from iscsi.
> - in cxgb3i.txt, added error message logged for not setting 
> MaxRecvDataSegmentLength properly.
> - renamed cxgb3i Makefile to Kbuild
> - removed "select ISCSI_TCP" in Kconfig
> - consistent handling of AHS: on tx, reserve rooms for AHS; on rx, assume we 
> could receive AHS.
> - add support of bi-directional commands for ddp setup,
> 
> The cxgb3i driver, especially the part handles the offloaded iscsi tcp 
> connection mangement, has gone through the netdev review 
> (http://marc.info/?l=linux-netdev&m=121944339211552, 
> http://marc.info/?l=linux-netdev&m=121989660016124).
> 
> The cxgb3i driver provides iscsi acceleration (PDU offload and payload data 
> direct placement) to the open-iscsi initiator. It accesses the hardware 
> through the cxgb3 module.
> 

Hello!

Do you guys have performance comparison/numbers for normal open-iscsi over tcp 
vs. cxgb3i accelerated?

Would be nice to see throughput/iops/cpu-usage statistics..

-- Pasi

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