[ofw] Current IPoIB performance with WinOF

[Tzachi Dar]

A few comments about your question:

1) SDR cards can only reach about 7.7G bit of bw due to the 8:10 encoding and other overhead.
2) There haven't been a lot of work done on performance on the last years, but checksum offload and large send offload have been added (assuming that your card support it. Connectx is an example to a card that supports this features).
3) Using 4k MTU should allow you to reach higher bw. (again, you will need Connectx).
4) Since computers are much stronger today than they have been on 2007, you should be able to reach very close to the theoretical bw (of SDR).
5) When working with full bw cpu of the receiver will be the bottleneck.
6) Our software is being tested on windows server 2008 R2. This is one of the operating systems that we do whql on. We believe that it should also work for windows 7 64 bits, but we don't really test there.

Thanks
Tzachi


________________________________
From: ofw-bounces at lists.openfabrics.org [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Ishaan Dalal
Sent: Monday, March 08, 2010 2:03 AM
To: ofw at lists.openfabrics.org
Subject: [ofw] Current IPoIB performance with WinOF

Hi,

I'd like to experiment with IB as a cheap 10+ Gbps point-to-point interconnect (4x SDR adapters are available quite cheap) between a video editing workstation (Win 7 x64) and a storage server (Server 2008 R2). SMB will be used to maintain compatibility with other existing clients. The server is a fairly powerful machine (dual-core Core i5) with a RAID subsystem that can saturate a gigabit link several times over.

Digging through list archives to determine IPoIB performance in Windows, the latest I could find were posts from 2006-2007 that claimed performance was poor because the way IPoIB was implemented was extremely CPU-intensive. How much has IPoIB performance improved with the newer WinOF/NDIS versions? Is it still as tightly CPU-bound?

Thanks,
-Ishaan
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