Throughput @100Mbs on link of ~10ms latency

From: Mark Henson (kern@wolf.ericsson.net.nz)
Date: Fri Oct 05 2001 - 00:46:03 EST


Hi,

Can someone give me a pointer to a FAQ on how to tune a 2.4 machine to
achieve high throughput (approx i/f speed 100Mbits/sec) on a link with the
following characteristics:

Latency Throughput

9-10ms 3.8 MByte/s
3-4ms 7-8MByte/s

I have implemented:

echo "4096 87380 4194304" > /proc/sys/net/ipv4/tcp_rmem
echo "4096 65536 4194304" > /proc/sys/net/ipv4/tcp_wmem

from http://www-didc.lbl.gov/tcp-wan.html

this lifted the performance from ~1MByte/s to the 3.8 above.

When the receiving machine is freebsd I get 10.05 MBytes/s which
is interesting - but when sending from BSD I get the same rate.

cheers
Mark

[root@tsaturn ncftp]# lsmod
Module Size Used by
autofs 11264 1 (autoclean)
3c59x 25344 1 (autoclean)
e100 44240 1 (autoclean)
ipchains 38976 0 (unused)

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This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:35 EST