[ewg] FW: [Bug 636] New: OFED-1.2-20070522-0600 perftest/MPI latency worse by 4 usec on Cheetah DDR

[Scott Weitzenkamp (sweitzen)]

The recent changes to fix IPoIB HA have caused major MPI/perftest IB
latency problems.

Scott
 

> -----Original Message-----
> From: bugzilla-daemon at lists.openfabrics.org 
> [mailto:bugzilla-daemon at lists.openfabrics.org] 
> Sent: Tuesday, May 22, 2007 10:08 PM
> To: Scott Weitzenkamp (sweitzen)
> Subject: [Bug 636] New: OFED-1.2-20070522-0600 perftest/MPI 
> latency worse by 4 usec on Cheetah DDR
> 
> https://bugs.openfabrics.org/show_bug.cgi?id=636
> 
>            Summary: OFED-1.2-20070522-0600 perftest/MPI 
> latency worse by 4
>                     usec on Cheetah DDR
>            Product: OpenFabrics Linux
>            Version: 1.2rc3
>           Platform: X86-64
>         OS/Version: RHEL 4
>             Status: NEW
>           Severity: blocker
>           Priority: P1
>          Component: IB Core
>         AssignedTo: mst at mellanox.co.il
>         ReportedBy: sweitzen at cisco.com
>                 CC: tziporet at mellanox.co.il
> 
> 
> RHEL4 x86_64 Cheetah DDR, tested on both Dell PE1950 and Dell PE1850.
> 
> OFED-1.2-20070517-0600 is OK.
> 
> Looks like the patches in OFED-1.2-20070521-0600 or 
> OFED-1.2-20070522-0600 are
> causing problems.
> 
> MPI latency (as measured by osu_latency) has jumped from 3.35 
> usec to 7.35
> usec.  ib_rdma_lat latency has also jumped from 3 usec to 7 usec.
> 
> 
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