nanog mailing list archives
sizing router buffers (Re: Software router state of the art )
From: Mikael Abrahamsson <swmike () swm pp se>
Date: Wed, 23 Jul 2008 23:48:08 +0200 (CEST)
On Wed, 23 Jul 2008, Kevin Oberman wrote:
be of any use at all. This would require 3 GB of buffers. This same problem also make TCP off-load of no use at all.
3 Gigabyte? Why?The newer 40G platforms on the market seems to have abandonded the 600ms buffers typical in the 10G space, in favour of 50-200ms of buffers (I don't remember exactly).
Aren't there TCP implementations that don't use exponential window increase, but instead can do smaller increments, which I would have believed would enable routers to still do well with ~50ms of buffering.
High speed memory is very expensive, also a lot of applications today would prefer to have their packets dropped instead of being queued for hundreds of milliseconds. Finding a good tradeoff level between the demand of different traffic types is quite hard...
Also, DWDM capacity seems to get cheaper all the time, so if you really need to move data at multigigabit speeds, it might make sense to just rent that 10G wave and put your own equipment there that does what you want.
-- Mikael Abrahamsson email: swmike () swm pp se
Current thread:
- Re: Software router state of the art, (continued)
- Re: Software router state of the art Bill Nash (Jul 28)
- Re: Software router state of the art Florian Weimer (Jul 28)
- Re: Software router state of the art William Herrin (Jul 23)
- Re: Software router state of the art Naveen Nathan (Jul 23)
- Re: Software router state of the art Christopher Morrow (Jul 23)
- Re: Software router state of the art Wes Young (Jul 23)
- Message not available
- Re: Software router state of the art William Herrin (Jul 23)
- Re: Software router state of the art Kevin Oberman (Jul 23)
- Re: Software router state of the art William Herrin (Jul 23)
- Re: Software router state of the art Kevin Oberman (Jul 23)
- sizing router buffers (Re: Software router state of the art ) Mikael Abrahamsson (Jul 23)
- Exploit for DNS Cache Poisoning - RELEASED Robert D. Scott (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED Joe Greco (Jul 23)
- RE: Exploit for DNS Cache Poisoning - RELEASED Robert D. Scott (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED David Conrad (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED Mike Lewinski (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED Kevin Day (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED Joe Greco (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED William Herrin (Jul 23)
- Re: Exploit for DNS Cache Poisoning - RELEASED Joe Greco (Jul 24)
- Re: Exploit for DNS Cache Poisoning - RELEASED Tony Finch (Jul 24)