nanog mailing list archives
RE: 923Mbits/s across the ocean
From: "Cottrell, Les" <cottrell () SLAC Stanford EDU>
Date: Sun, 09 Mar 2003 08:29:16 -0800
Also as the OS's are shipped they come with small default maximum window sizes (I think Linux is typically 64KB and Solaris is 8K), and so one has to get the sysadmin with root privs to change this. -----Original Message----- From: Iljitsch van Beijnum [mailto:iljitsch () muada com] Sent: Sunday, March 09, 2003 5:25 AM To: Joe St Sauver Cc: nanog () nanog org Subject: Re: 923Mbits/s across the ocean On Sat, 8 Mar 2003, Joe St Sauver wrote:
you will see that for bulk TCP flows, the median throughput is still only 2.3Mbps. 95th%-ile is only ~9Mbps. That's really not all that great, throughput wise, IMHO.
Strange. Why is that? RFC 1323 is widely implemented, although not widely enabled (and for good reason: the timestamp option kills header compression so it's bad for lower-bandwidth connections). My guess is that the OS can't afford to throw around MB+ size buffers for every TCP session so the default buffers (which limit the windows that can be used) are relatively small and application programmers don't override the default.
Current thread:
- Re: 923Mbits/s across the ocean, (continued)
- Re: 923Mbits/s across the ocean Douglas F. Calvert (Mar 10)
- Re: 923Mbits/s across the ocean Iljitsch van Beijnum (Mar 08)
- RE: 923Mbits/s across the ocean Cottrell, Les (Mar 08)
- RE: 923Mbits/s across the ocean alex (Mar 08)
- RE: 923Mbits/s across the ocean E.B. Dreger (Mar 08)
- RE: 923Mbits/s across the ocean Cottrell, Les (Mar 08)
- Re: 923Mbits/s across the ocean Joe St Sauver (Mar 08)
- Re: 923Mbits/s across the ocean Iljitsch van Beijnum (Mar 09)
- Re: 923Mbits/s across the ocean David G. Andersen (Mar 09)
- Re: 923Mbits/s across the ocean Iljitsch van Beijnum (Mar 09)
- RE: 923Mbits/s across the ocean Cottrell, Les (Mar 08)
- RE: 923Mbits/s across the ocean Cottrell, Les (Mar 09)
- Re: 923Mbits/s across the ocean Richard A Steenbergen (Mar 09)
- Re: 923Mbits/s across the ocean Iljitsch van Beijnum (Mar 10)
- Re: 923Mbits/s across the ocean Richard A Steenbergen (Mar 10)
- Re: 923Mbits/s across the ocean Iljitsch van Beijnum (Mar 11)
- Re: 923Mbits/s across the ocean William Allen Simpson (Mar 15)
- Re: 923Mbits/s across the ocean Richard A Steenbergen (Mar 09)
- Re: 923Mbits/s across the ocean Stephen Sprunk (Mar 11)