nanog mailing list archives
Re: TCP and WAN issue
From: "Steve Meuse" <smeuse () gmail com>
Date: Tue, 27 Mar 2007 21:40:07 -0400
On 3/27/07, Lincoln Dale <ltd () interlink com au> wrote:
even on "default settings" on a modern TCP stack, getting close to path-line-rate on a 80msec RTT WAN @ DS3 speeds with a single TCP stream should not be that difficult. the Windows TCP stack as of Windows XP SP2 has some fairly decent defaults. it will do RFC1323 / large windows / SACK., but all of these can be tuned with registry settings if you wish.
I was under the impression that XP's default window size was 17,520 bytes, rfc1323 options disabled. Assuming 80ms and 45Mb/s, I come up with a window size of 440Kbytes required to fill the pipe. At windows default I would only expect to see 220Kbs over that same path. I think even modern *nix OSs tend to have default window sizes in the 64kB region, still not enough for that Bandwidth/delay. -- -Steve
Current thread:
- [no subject], (continued)
- [no subject] Jim Shankland (Mar 27)
- RE: Jumbo frames michael.dillon (Mar 27)
- RE: Jumbo frames Jim Shankland (Mar 27)
- Re: Jumbo frames Andy Davidson (Mar 29)
- RE: Jumbo frames michael.dillon (Mar 29)
- Re: Jumbo frames Stephen Sprunk (Mar 30)
- [no subject] Jim Shankland (Mar 27)
- RE: Jumbo frames Hank Nussbacher (Mar 27)
- Re: Perry Lorier (Mar 27)
- Re: TCP and WAN issue Steve Meuse (Mar 27)
- Re: TCP and WAN issue Andre Oppermann (Mar 28)
- Re: TCP and WAN issue Marshall Eubanks (Mar 28)
- Re: TCP and WAN issue Simon Leinen (Mar 28)
- Re: TCP and WAN issue Roland Dobbins (Mar 27)
- RE: TCP and WAN issue michael.dillon (Mar 27)
- Re: TCP and WAN issue Roland Dobbins (Mar 27)