On Thu, 2011-09-29 at 21:12 -0700, reaper wrote:
> sounds like your sysctl.conf needs tweaking? have you tried something like
> this on both sides?
>
> kernel.msgmnb = 65536
> kernel.msgmax = 65536
> kernel.shmmax = 68719476736
> kernel.shmall = 4294967296
>
> # long fat pipes
> net.core.wmem_max = 8388608
> net.core.rmem_max = 8388608
>
> Yes, I tried to tweak kernel first with no effect. BTW wouldn't badly tuned
> network stack affect other programs such as iperf and ssh?
hi repear,
i'm going through a similar issue -- zurich, barca, copenhagen ...
iperf's results will differ dramatically depending on the tcp window
size -- here's what i'm testing with:
server side (distant): /usr/bin/iperf -s -w 4096KB
client side (near): iperf -w4096KB -c distant.Server.IP.addr
(remember that iperf doubles the -w argument)
i have noticed that scp is not a good measure of throughput -- i do not
know why. i use an openvpn tunnel between sites and loose about 20% of
throughput due to the tunnel. check window size on distant machine
(using wireshark) to verify that some upstream device is not changing
it.
here's good site that discusses window size -- you can also google "long
fat networks" for a detailed discussion;
http://bradhedlund.com/2008/12/19/how-to-calculate-tcp-throughput-for-long-distance-links/
cheers
m
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