nanog mailing list archives
Re: 10GE TOR port buffers (was Re: 10G switch recommendaton)
From: Saku Ytti <saku () ytti fi>
Date: Sat, 28 Jan 2012 12:07:24 +0200
On (2012-01-27 22:40 +0100), bas wrote:
But do you generally agree that "the market" has a requirement for a deep-buffer TOR switch? Or am I crazy for thinking that my customers need such a solution?
No, you're not crazy. If your core is higher rate than your customer, then you need at minimum serialization delay difference of buffering. If core is 10G and access 100M, you need buffer for minimum of 100 packets, to handle the single 10G incoming, without any extra buffering. Now if you add QoS on top of this, you probably need 100 per each class you are going to support. And if switch does support QoS but operator configures only BE, and operator does not limit BE queue size, operator will see buffer bloat, and think it's clueless vendor dropping expensive memory there for the lulz, while it's just misconfigured box. When it comes to these trident+ 64x10GE/48x10GE+4x40G, your serialization delay difference between interfaces is minimal, and so is buffering demand. -- ++ytti
Current thread:
- Re: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)), (continued)
- Re: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) Leo Bicknell (Jan 27)
- Re: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) Leo Bicknell (Jan 27)
- RE: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) George Bonser (Jan 27)
- Re: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) Jared Mauch (Jan 29)
- RE: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) George Bonser (Jan 29)
- RE: pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) George Bonser (Jan 29)
- BDP discussion pointers: was: Re pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) Jim Gettys (Jan 28)
- Re: BDP discussion pointers: was: Re pontification bloat (was 10GE TOR port buffers (was Re: 10G switch recommendaton)) Jim Gettys (Jan 28)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Leo Bicknell (Jan 27)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Ćukasz Bromirski (Jan 27)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Saku Ytti (Jan 28)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Masataka Ohta (Jan 28)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Saku Ytti (Jan 28)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Masataka Ohta (Jan 28)
- Re: 10GE TOR port buffers (was Re: 10G switch recommendaton) Saku Ytti (Jan 28)