On Fri, Jul 26, 2002 at 06:40:06PM +0200, Roland Kuhn wrote:
> On Fri, 26 Jul 2002, Marc Haber wrote:
> > it looks like reading from a socket opened with PF_PACKET, SOCK_DGRAM
> > loses data if the system is non-trivially loaded.
> >
> What exactly is this non-trivial load?
ISP-backbone type of load, roughly 5000 Packets a second, 8 Mbit
sustained.
> If it sometimes consumes the whole
> of its timeslice then your net-acct is not scheduled for at least 10ms
> which makes up about 50 packets. I don't know how long the queue is,
> though... (might be 64kB, 50*mtu=75kB)
We have set {r|w}mem_{max|default} to 256 Kbyte, but your calculation
makes sense.
Can the program learn if the queue has overflowed, so that it is able
to yell at its admins for a larger queue? How can I give net-acct a
chance to empty the queue before it is deferred again?
Greetings
Marc
--
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Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Karlsruhe, Germany | lose things." Winona Ryder | Fon: *49 721 966 32 15
Nordisch by Nature | How to make an American Quilt | Fax: *49 721 966 31 29
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