Messages in this thread | | | Date | Thu, 2 Sep 2004 23:19:50 +0200 | From | Andi Kleen <> | Subject | Re: [RFC] Use RCU for tcp_ehash lookup |
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On Wed, Sep 01, 2004 at 05:06:41PM +0530, Srivatsa Vaddagiri wrote: > | 2.6.8.1 | 2.6.8.1 + my patch > ------------------------------------------------------------------------------- > Average cycles | | > spent in | | > __tcp_v4_lookup_established | 2970.65 | 668.227 > | (~3.3 micro-seconds) | (~0.74 microseconds) > ------------------------------------------------------------------------------- > > This repesents improvement by a factor of 77.5%!
Nice.
> > > > > > And it should also fix the performance problems with > > cat /proc/net/tcp on ppc64/ia64 for large hash tables because the rw locks > > are gone. > > But spinlocks are in! Would that still improve the performance compared to rw > locks? (See me earlier note where I have explained that lookup done for > /proc/net/tcp is _not_ lock-free yet).
Yes, spinlocks are much faster than rwlocks.
-Andi
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