[openib-general] uverbs: pthread_mutex -> pthread_spinlock ?

[Tziporet Koren]

In VAPI we used spinlocks from this reason on all data-path verbs and it
gave us better performance.

Tziporet

-----Original Message-----
From: Michael S. Tsirkin [mailto:mst at mellanox.co.il]
Sent: Thursday, March 10, 2005 12:47 PM
To: openib-general at openib.org
Subject: [openib-general] uverbs: pthread_mutex -> pthread_spinlock ?


I am able to shave about 200ns off the rdma post latency,
by using pthread_spinlock instead of pthread_mutex for protecting
the qp post op in libmthca.

I'm aware of course that a context switch when spinlock is held may
waste a whole timeslice , but maybe for short operations such as this
it's reasonable to use spinlocks?

-- 
MST - Michael S. Tsirkin
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