nanog mailing list archives
Re: Link capacity upgrade threshold
From: "Kevin Oberman" <oberman () es net>
Date: Sun, 30 Aug 2009 09:22:59 -0700
Date: Sun, 30 Aug 2009 21:04:15 +0900 From: Randy Bush <randy () psg com>If your 95th percentile utilization is at 80% capacity, it's time to start planning the upgrade.s/80/60/ the normal snmp and other averaging methods *really* miss the bursts.
s/60/40/ If you need to carry large TCP flows, say 2Gbps on a 10GE, dropping even a single packet due to congestion is unacceptable. Even with fast recovery, the average transmission rate will take a noticeable dip on every drop and even a drop rate under 1% will slow the flow dramatically. The point is, what is acceptable for one traffic profile may be unacceptable for another. Mail and web browsing are generally unaffected by light congestion. Other applications are not so forgiving. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman () es net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
Current thread:
- Re: Link capacity upgrade threshold, (continued)
- Re: Link capacity upgrade threshold Justin Wilson - MTIN (Aug 29)
- Re: Link capacity upgrade threshold William Herrin (Aug 29)
- Re: Link capacity upgrade threshold Mikael Abrahamsson (Aug 29)
- Re: Link capacity upgrade threshold Patrick W. Gilmore (Aug 30)
- Re: Link capacity upgrade threshold Richard A Steenbergen (Aug 30)
- Re: Link capacity upgrade threshold Mikael Abrahamsson (Aug 29)
- Re: Link capacity upgrade threshold Randy Bush (Aug 30)
- Re: Link capacity upgrade threshold Nick Hilliard (Aug 30)
- Re: Link capacity upgrade threshold Peter Hicks (Aug 30)
- Re: Link capacity upgrade threshold Shane Ronan (Aug 30)
- Re: Link capacity upgrade threshold Nick Hilliard (Aug 30)
- Re: Link capacity upgrade threshold Kevin Oberman (Aug 30)
- RE: Link capacity upgrade threshold Erik L (Aug 30)
- Re: Link capacity upgrade threshold Mohacsi Janos (Aug 31)