[gentoo-user] Re: NIC setup? slow transfer speed

[Remy Blank <remy.blank_asps@pobox.com>]

Stuart Howard wrote:
> OK well I give up

I did, too...

> Transfer 39Mb file from
> gentoo -> XP share using winXP copy trans time >=5 mins [gentoo smb
> directory to XP share dir ie. XP shared dir Not mounted]

I have a similar situation here, but with an additional interesting
observation. If I copy a file from WinXP to an SMB share on a Gentoo
server with the XP explorer, I get about 2MB/s throughput, which is not
all too much on a 100Mb/s network. However, if I run the following
command in the background (eth0 being the interface over which I copy):

  tcpdump -n -i eth0 >/dev/null

the throughput increases to about 8-10MB/s!

I have no idea where this could come from. The only explanation I can
see is that tcpdump puts eth0 into a sort of promiscuous mode, which
interacts favorably in the SMB protocol. But I haven't been able to
figure out how I should tune eth0 to get the same results without tcpdump.

-- Remy


Remove underscore and suffix in reply address for a timely response.

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