From: "David S. Miller" <davem@redhat.com>
To: greearb@candelatech.com
Cc: john@grabjohn.com, cfriesen@nortelnetworks.com, ahu@ds9a.nl,
linux-kernel@vger.kernel.org
Subject: Re: problems achieving decent throughput with latency.
Date: Tue, 04 Feb 2003 00:41:51 -0800 (PST) [thread overview]
Message-ID: <20030204.004151.22906189.davem@redhat.com> (raw)
In-Reply-To: <3E3F7CDA.9020701@candelatech.com>
From: Ben Greear <greearb@candelatech.com>
Date: Tue, 04 Feb 2003 00:42:02 -0800
Am I correct that if I have 10k clients doing their worst tricks, and
3 * (80k, my default according to the kernel) == 240k, then I have at most
2.4MB denial of service? Assuming 60k clients, that is only about 15MB
of DoS? If true, that is a fairly small time DoS considering the RAM available
on today's machines.
Add in the struct sk_buff for each packet as well, which is dependant
upon MSS. Thus you could make the clients use a super-small MSS to
get more per-packet struct sk_buff overhead. The list goes on and on.
At least Linux, unlike BSD, makes an attempt to account for the
sk_buff overhead in the limits :-)
next prev parent reply other threads:[~2003-02-04 8:45 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-02 7:38 problems achieving decent throughput with latency Ben Greear
2003-02-02 11:48 ` bert hubert
2003-02-03 5:14 ` David S. Miller
2003-02-03 15:37 ` Chris Friesen
2003-02-03 16:11 ` John Bradford
2003-02-03 16:19 ` bert hubert
2003-02-03 18:03 ` Ben Greear
2003-02-03 19:18 ` Eric Weigle
2003-02-04 5:19 ` David S. Miller
2003-02-04 7:50 ` Ben Greear
2003-02-04 7:39 ` David S. Miller
2003-02-04 8:42 ` Ben Greear
2003-02-04 8:41 ` David S. Miller [this message]
2003-02-04 8:51 ` Ben Greear
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