Re: [RFC] Lock free fd lookup

[Chris Wright]

* Ravikiran G Thirumalai (kiran@xxxxxxxxxx) wrote:
> This makes use of the lockfree refcounting infrastructure (see earlier
> posting today) to make files_struct.fd[] lookup lockfree. This is carrying 
> forward work done by Maneesh and Dipankar earlier. 
> 
> With the lockfree fd lookup patch, tiobench performance increases by 13% 
> for sequential reads, 21 % for random reads on a 4 processor pIII xeon.

I'm curious, how much of the performance improvement is from RCU usage
vs. making the basic syncronization primitive aware of a reader and
writer distinction?  Do you have benchmark for simply moving to rwlock_t?

thanks,
-chris
-- 
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