serious networking (em) performance (ggate and NFS) problem
shino at fornext.org
Sun Nov 21 04:27:11 PST 2004
Jeremie, thank you for your comment.
I did simple benchmark at some settings.
I used two boxes which are single Xeon 2.4GHz with on-boarded em.
I measured a TCP throughput by iperf.
These results show that the throughput of TCP increased if Interrupt
Moderation is turned OFF. At least, adjusting these parameters affected
TCP performance. Other appropriate combination of parameter may exist.
The settings are some combinations of
In this mail, A setting,
is abbreviated to (0, 66, 66, 66, 8000).
TCP window size was not adjusted by iperf's options. It mean that iperf
is used by default setting.
sender : default(0, 66, 66, 66, 8000), receiver : default(0, 66, 66, 66,
1st trial 852Mbps
2nd trial 861Mbps
3rd trial 822Mbps
4th trial 791Mbps
5th trial 826Mbps
average 830.4Mbps, std. dev. 27.6Mbps
sender : (0, 0, 0, 0, 8000), receiver : (0, 0, 0, 0, 8000)
1st trial 787Mbps
2nd trial 793Mbps
3rd trial 843Mbps
4th trial 771Mbps
5th trial 848Mbps
average 808.4Mbps, std. dev. 34.9Mbps
sender : off(0, 0, 0, 0, 0), receiver : off(0, 0, 0, 0, 0)
1st trial 902Mbps
2nd trial 901Mbps
3rd trial 899Mbps
4th trial 894Mbps
5th trial 900Mbps
average 899.2Mbps, std. dev. 3.1Mbps
Shunsuke SHINOMIYA <shino at fornext.org>
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