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Date: Thu, 7 Mar 2002 10:10:42 -0500 (EST)
From: Kenneth Culver <culverk@alpha.yumyumyum.org>
To: Russo Roberto <atm_roberto@yahoo.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: (FreeBSD TCP) vs (Linux TCP)
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Use a newer version of FreeBSD, like 4.5. It has a lot of fixes and
enhancements that might change the tests you're doing.

Ken

On Thu, 7 Mar 2002, Russo Roberto wrote:

>   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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