[ofa-general] RE: [Scst-devel] SRP aggregate bandwidth decreasing as threads increase

[Sufficool, Stanley]

IIRC, The SRP Target code has many context switches that throttle
performance at higher thread counts.

> -----Original Message-----
> From: Chris Worley [mailto:worleys at gmail.com] 
> Sent: Monday, May 18, 2009 9:21 AM
> To: OpenIB; scst-devel
> Subject: [Scst-devel] SRP aggregate bandwidth decreasing as 
> threads increase
> 
> 
> I'm seeing peak performance at ~4 threads (1.6GB/s), w/ 
> threads >10 I'm seeing aggregate performance drop 
> significantly.  This is not a drive issue: locally, the 
> drives get best performance >~32 threads, and maintain their 
> aggregate way beyond that.
> 
> Is there any tunable parameter or source code change in the 
> initiator or target code that would effect performance with a 
> high thread count?
> 
> Thanks,
> 
> Chris
> 
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