Date: Fri, 5 Apr 1996 12:34:24 -0500 From: dennis@etinc.com (dennis) To: hackers@freebsd.org Subject: Re: Freebsd Vs. Linux Message-ID: <199604051734.MAA10337@etinc.com>
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>X-Sender: tjeffers@nastg.gsfc.nasa.gov
>Date: Fri, 05 Apr 1996 11:30:09 -0500
>To: dennis@etinc.com (dennis)
>From: Anthony Jefferson <tjeffers@nastg.gsfc.nasa.gov>
>Subject: Re: Freebsd Vs. Linux
>
>At 10:41 AM 4/4/96 -0500, you wrote:
>
>>>You can increase the buffer space to get rid of the ENOBUF errors, but
>>>they are really "backoff and retransmit warnings". The other OS's you
>>>tested are probably silenty dropping the packets.
>>
>>or queueing endlessly . There are good reasons to limit queue space, and
>>if you overflow this with a non-realistic test then you havent learned very
>>little. These can be tuned, I believe, as well. I think IFQ_MAXLEN is 50,
>> which is really too small for an ethernet link (note that I think it is 300
>>in LINUX),
>> particularly if the traffic is largely small packets that are being
>>pummelled onto
>> the line. You may try tuning this value (in /usr/src/sys/net/if.h) and see
>>what happens.
>>
>
>Thanks, your statement about "backoff and retransmit" was exactly the
>senario we were experiencing. We had never had any OS tell us before
>dropping the packets. What a nice change.
>
>We are also doing some work with multicast, was 2.0 BSD released with
>multicast enabled and 2.1 disabled. We tried to join a multicast group using
>2.1 and received some errors. In addtion, when we do a netstat -g we receive:
>
>muiltcast not compiled into the system.
>
>A fairly good indication we have something wrong. How do you enable
>multicast in 2.1 ? I did not see any config parameters related to multicast ?
>
>Well, thanks again for the response. BSD was the OS we wanted to use!
>
>*******************************************************************************
>* Anthony C. Jefferson Phone:(301)794-2895 FAX:(301) 794-9530
>* Computer Sciences Corp. 7700 Hubble Drive Lanham-Seabrook Md. 20706
>* E-MAIL:tjeffers@nastg.gsfc.nasa.gov 8-{)
>*******************************************************************************
>
>
>
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