Subject: Re: 2.6.17: networking bug??

From: John Heffner <[email-masked]>
Date: Tue, 13 Jun 2006 21:25:34 -0400

Rick Jones wrote:
>> One final word about window sizes.  If you have a connection whose
>> bandwidth-delay-product needs an N byte buffer to fill, you actually
>> have to have an "N * 2" sized buffer available in order for fast
>> retransmit to work.
> 
> Is that as important in the presence of SACK?

With SACK you do need up to N * 2, but no more.  With New Reno, you 
potentially need ~ N * (number of losses) or it will time out... yuck. 
SACK is a good thing. :)

   -John