From: mru@kth.se (Måns Rullgård)
To: KyoungSoo Park <kyoungso@cs.princeton.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: how to detect udp packets drops ?
Date: Wed, 10 Mar 2004 22:20:53 +0100 [thread overview]
Message-ID: <yw1xoer4xutm.fsf@kth.se> (raw)
In-Reply-To: <404F855E.9090009@cs.princeton.edu> (KyoungSoo Park's message of "Wed, 10 Mar 2004 16:15:10 -0500")
KyoungSoo Park <kyoungso@cs.princeton.edu> writes:
> Thank you for your kind response. But, if I follow your test
> senario, I cannot know which entity drops the packets. Routers on
> the path also can get congested and may drop the packets.
That is true.
> What I really want is to know is if the "kernel"(whch is supposed to
> receive packets) drops packets.
Do you mean you want to know if the kernel's receive buffer overflows?
That could be possible in theory, but I don't know whether it's
possible with the current Linux kernels.
> Also I don't want to contribute to the congestion by sending test UDP
> packets, because that may worsen the situation.
> Isn't there any way to monitor the packet drops at the end host by
> just looking at the "packet drop counter"?
If the packet reaches the end host the only reason for dropping it
would be a filled receive buffer. The size of the buffer can be set
using setsockopt().
--
Måns Rullgård
mru@kth.se
prev parent reply other threads:[~2004-03-10 21:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-09 21:28 Read-only bind mounts - will they be included in 2.4.x kernel? Frank Myhr
2004-03-10 19:41 ` how to detect udp packets drops ? KyoungSoo Park
2004-03-10 20:51 ` Måns Rullgård
[not found] ` <404F855E.9090009@cs.princeton.edu>
2004-03-10 21:20 ` Måns Rullgård [this message]
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