[ofa-general] Performance of MT25204 versus MT25208

[Sagi Rotem]

Did you check that the PCIe slot you are using is x8  

-----Original Message-----
From: general-bounces at lists.openfabrics.org
[mailto:general-bounces at lists.openfabrics.org] On Behalf Of Bart Van
Assche
Sent: Thursday, January 17, 2008 6:06 PM
To: Openib-General
Subject: [ofa-general] Performance of MT25204 versus MT25208

Hello,

Via ib_rdma_bw and ib_rdma_lat I obtained the following performance
data:
* peak bandwith 674 MB/s / latency 3.07 microseconds between two
uniprocessor systems with MT25204 HCA's.
* peak bandwith 935 MB/s / latency 3.36 microseconds between two dual
processor systems with MT25208 HCA's.

I'm wondering now whether the performance differences are due to the
HCA's or due to the motherboard ?

Software: 2.6.22.9 Linux kernel (64-bit x86_64) + OFED 1.2.5.4 userspace
components.

Bart.
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