Date: Thu, 7 Mar 2002 02:49:47 -0800 (PST) From: Russo Roberto <atm_roberto@yahoo.com> To: freebsd-questions@FreeBSD.ORG Subject: (FreeBSD TCP) vs (Linux TCP) Message-ID: <20020307104947.11294.qmail@web13006.mail.yahoo.com>
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Hi,
I am working to evaluate performance of
throughput between two PC connected between
a Fore-ATM card adapter to a network:
the netwotk is composed of a PVC of 4Mbps between
three routers and I am just looking to use
differente queuing discipline like FIFO-PQ-WFQ.
I have configured the two PC with the same Operating
Systems: a Linux (Red-Hat) and a FreeBSD v4.3 (Kame
Patch) and I am using NETPERF to make throughput
test.
Making the first tests I note a difference beetwen
using the two FreeBSD or the two LINUX:
[1]
for example when using FreeBSD-FIFO and make
a default TCP_STREAM Netperf with the deafult
values of SendSocketSize and ReceiverSocketSize
(16.000) the value of througput is lower (<2Mbps)
than the 3.5Mpbs that I have configured in the PVC;
however making the same test with the values of
SendSocketSize and ReceiverSocketSize of 128000
the test is good and I have the value of 3.45Mbps
using Linux-FIFO and make a default TCP_STREAM
with the deafult values of SendSocketSize
and ReceiverSocketSize (16.000) the value of
througput is of 3.5Mpbs.
[2]
using other queuing discipline I have always
to change in FreeBSD the values of
SendSocketSize and ReceiverSocketSize to have
values that seems the real condition of the
network; using Linux the values is always correct
without changing the values of the Sockets.
- anybody can help me to resolve this problem ?
Is the TCP/IP stacks of the two systems very
differents ? What is different ?
Why the Linux seems have the best performances ?
- Where I can find some documents that describe
the TCP stacks of the two systems ?
really Thanks...!!!!!
Roberto
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