Messages in this thread | | | Date | Wed, 27 Aug 2008 09:07:47 -0700 | From | Rick Jones <> | Subject | Re: loaded router, excessive getnstimeofday in oprofile |
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Andi Kleen wrote: > Evgeniy Polyakov <johnpol@2ka.mipt.ru> writes: > >>Yup, this innocent toys can end up with this such behaviour on modern >>highly loaded machines. > > > I and also other people had some patches to move the time stamp > measuring into the socket. This way the time stamping didn't need to > be enabled on all packets, only on those that actually end up at a > socket that requires the time stamp. > > Unfortunately DaveM didn't like it because some bank wanted > different semantics, see the discussion in > http://thread.gmane.org/gmane.linux.network/91679 > > Perhaps you can find out which bank it was and send them a bill for > your CPU time ;-)
Those banks really want to crank down on latency - to the point they start disabling interrupt coalescing. I bet they'd toss anything out they could to shave another microsecond.
rick jones
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