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Date:      Mon, 06 Dec 1999 13:56:15 -0700
From:      Warner Losh <imp@village.org>
To:        Mike Smith <msmith@FreeBSD.ORG>
Cc:        hackers@FreeBSD.ORG
Subject:   Re: tty level buffer overflows 
Message-ID:  <199912062056.NAA36534@harmony.village.org>
In-Reply-To: Your message of "Mon, 06 Dec 1999 11:53:43 PST." <199912061953.LAA00484@mass.cdrom.com> 
References:  <199912061953.LAA00484@mass.cdrom.com>  

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In message <199912061953.LAA00484@mass.cdrom.com> Mike Smith writes:
: Growing the buffer isn't the solution; it should be big enough already.  
: We need to work out why a system that should have no trouble with the 
: data rate in question is croaking so trivially.

Growing the buffer is a solution.  I only get a few of these very
rarely which tells me that the system is keeping up 99.999% of the
time.  Increasing the buffer size will, statistically speaking,
increase that by another .0009%, which is all I'm looking for.
Growing the buffer will allow the amont of latency in the worst case
to expand, which is what I want.  Also, it will work around the
problem until I can get a better solution....

At least for my setup.  I have a 486DX2-66 with lots of filter rules.
I suspect that what is happening is lots of tiny packets are coming
in which is causing increased latency in some cases.

Warner



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