[linux-dvb] Re: Network: a new hope

[Johannes Stezenbach <js@convergence.de>]

On Sat, Nov 08, 2003 at 06:57:49PM +0100, Emard wrote:
> On Sat, Nov 08, 2003 at 02:51:33PM +0100, Ralph Metzler wrote:
> > 
> > How exactly do you measure the packet loss?
> 
> First I increase sizes of IP rmem_* to cca 100 MB each, and netdev
> backlog to 20000 packets. This is a must otherwise the kernel
> wouldn't accept the incoming rate.

That's hilarous. The input data rate of the DVB stream is max.
about half of a 100Mbit ethernet card. Even old/slow CPUs can
handle that well.

But AFAIK the packet capture facility used by tcpdump/ethereal
is not lossless at high data rates.

Does "ifconfig" of "cat /proc/net/dev" report errors or dropped
packets? Have you seen the "FIXME"s in dvb_net.c?


Johannes


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