Look for the libpcap ringbuffer patch if you are having too many dropped
packets. generic libpcap starts dropping packets at about 50mb per
second, with the ringbuffer patch (should be able to find it on google) it
scales much higher.
Jason
The place where you made your stand never mattered.
Only that you were there... And still on your feet.
On Mon, 31 Jan 2005, Nuutti Kotivuori wrote:
Jeff Dike wrote:
[EMAIL PROTECTED] said:
Something somewhere is buffering a few packets, and dropping the
rest. When the transfer rate goes high enough and there's no
physical interface to create delay, the buffer gets full and the
majority of packets are discarded. However, no dropped counters
rise on any of the interfaces, nor are any kernel messages printed
from uml or the host.
Or, there's a locking bug somewhere that stalls the transfer for a
while every now and then.
If either of these it true, you should be able to track it down by
tcpdumping both inside and outside the UML and looking at timestamps
for a given packet or seeing which interface is dropping packets.
The problem with the dumping is that since the problems only occur at
high transfer speeds, and there's three places to dump from (both
virtual machines and host) - all my attempts to get a complete trace
of what is happening has been daunted by kernel dropping packets to be
tcpdumped since the tcpdump processes have not been able to read them
fast enough.
I will try again though, with a bit more preparation.
-- Naked
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