nanog mailing list archives
Re: Split flows across Domains
From: "Matt Buford" <matt () overloaded net>
Date: Tue, 24 Jan 2006 14:17:04 -0500
On Tue, 24 Jan 2006, Christopher L. Morrow wrote:
that was my thought... and yes, it could get ugly for tcp services. Why would you knowningly induce this complication?
When you want single flows to go faster than a single member link? (not that I am saying this is a good idea)
Actually, TCP handles out of order packets rather well as long as the reordering isn't too severe. You see a bunch of SACKs flying around, but as long as it doesn't get too out of hand it doesn't affect throughput.
It is the non-TCP protocols that often suffer. Many of them implement sequence numbers and simply drop out of order packets. From my own experience, RealPlayer UDP streams and PPTP are two examples that fail (or at least feel like 50% packetloss) under heavy reodering, where TCP continues to work reasonably well.
Years ago, I had ISDN and IDSL between home and the ISP I worked at, and out of curiosity I experimented with per-packet load balancing across these links. Reordering was rather severe, as these links had slow uneven speeds, and uneven latencies. TCP transfers got about 192kbit (75% total link capacity, 1.5 times single link capacity), but things like RealPlayer and PPTP VPNs were downright unusable.
Current thread:
- Re: Split flows across Domains, (continued)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)
- Re: Split flows across Domains Simon Leinen (Jan 25)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Christopher L. Morrow (Jan 24)
- Re: Split flows across Domains Matt Buford (Jan 24)
- Re: Split flows across Domains Joe Abley (Jan 24)
- Re: Split flows across Domains Steven M. Bellovin (Jan 25)
- Re: Split flows across Domains Robert E . Seastrom (Jan 24)