Andrew Morton a écrit :
> Eric Dumazet <[email protected]> wrote:
>
>> Please (re)consider this patch since it really reduce CPU load and/or memory
>> bus trafic between CPUS.
>
>
> Did you actually measure this? If so, you should publish the results.
>
>
Hi Andrew
Well yes I did.
Here is part of the mail sent on netdev one month ago :
Hi David
I played and I have very good results with the following patches.
# tc -s -d qdisc show dev eth0 ; sleep 10 ; tc -s -d qdisc show dev eth0
qdisc pfifo_fast 0: bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
Sent 440173135511 bytes 3211378293 pkt (dropped 240817, overlimits 0
requeues 27028035)
backlog 0b 0p requeues 27028035
qdisc pfifo_fast 0: bands 3 priomap 1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
Sent 440216655667 bytes 3211730812 pkt (dropped 240904, overlimits 0
requeues 27031668)
backlog 0b 0p requeues 27031668
(So about 360 requeues per second, much better than before (12000 / second))
oprofile results give
0.6257 % qdisc_restart (instead of 2.6452 %)
thread is archived here :
http://marc.theaimsgroup.com/?l=linux-netdev&m=112521684415443&w=2
Thank you
Eric
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