Messages in this thread | | | Date | Wed, 8 Dec 2004 06:39:53 +0100 | From | Willy Tarreau <> | Subject | Re: _High_ CPU usage while routing (mostly) small UDP packets |
| |
On Tue, Dec 07, 2004 at 12:21:39PM +0100, Karsten Desler wrote:
> > I also notice that a lot of time is spent allocating > > and freeing the packet buffers (and possible hidden > > time due to cache misses due to allocating on one > > CPU and freeing on another?). > > How many [RT]xDescriptors do you have configured by the way? > > 256. I increased them to 1024 shortly after the profiling run, but > didn't notice any change in the cpu usage (will try again with cyclesoak).
Have you checked the interrupts rate ? I had an e1000 eating many CPU cycles because it would generate 50000 interrupts/s. Passing the module InterruptThrottleRate=5000 definitely calmed it down, and more than doubled the data rate.
Regards Willy
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |