Messages in this thread |  | | Date | Tue, 16 Oct 2001 15:00:16 +0200 | From | Martin Dalecki <> | Subject | Re: sendto syscall is slow |
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Martin Devera wrote: > > Hello, > > i'm doing new qos discipline developement and use own > mesurment tool. It simply uses PF_PACKET and then > doing sendto/recv simulating various flows. > (I use both lo and eth0 where I short-connected RX-TX > pins in single ethcard) > > I can't get beyond 25 000 packets per second. gprof: > Each sample counts as 0.01 seconds. > % cumulative self self total > time seconds seconds calls ms/call ms/call name > 35.67 5.39 5.39 498750 0.01 0.01 sendto > 26.67 9.42 4.03 1000826 0.00 0.00 poll > 19.06 12.30 2.88 498750 0.01 0.01 recv > > Is there any faster way to force raw packets to kernel ? I need > to push qos discipline to its edge but I can't because send > syscall is bottleneck. > Is it possible to tx multiple packets in sinhle call or should > I extend kernel myself for this testing purpose ?
Increase the HZ constant in the kernel, which is determining the sceduler frequency, which is apparently due to BH handling acting as a low-pass filder for your siganls here. However please beware of many possible sideffects this may have on your system. - 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/
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