sendto syscall is slow

From: Martin Devera (devik@cdi.cz)
Date: Tue Oct 16 2001 - 07:45:47 EST


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 ?

thanks, devik

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This archive was generated by hypermail 2b29 : Tue Oct 23 2001 - 21:00:14 EST