nanog mailing list archives
RE: PMTU-D: remember, your load balancer is broken
From: "Roeland Meyer (E-mail)" <rmeyer () mhsc com>
Date: Wed, 14 Jun 2000 09:06:52 -0700
Valdis.Kletnieks () vt edu: Wednesday, June 14, 2000 8:07 AM On Tue, 13 Jun 2000 22:36:08 MDT, Marc Slemko said:
It is also a concern that, in my experience, many of the
links with
MTUs <1500 are also the links with greater packet loss, etc.
so
you really don't want fragmentation on them.The worst part here is that I suspect that most of these links (just on sheer numbers of shipped product) are the aformentioned Win98
576-MTU. I just set my dial PPP ports to MTU=512+40=552, is this wrong? Where does the MTU=576 number come from?
I seem to remember that the *original* motivation for
slow-start and
all that was Van Jacobson's observation that the most common
cause of
a TCP retransmit was that an *entire* packet had been silently
dropped
due to queueing congestion, and could thus be treated identical
to
an ICMP Source Quench. Has this changed? Has "fragmentation" become a Great Evil, rather than an annoyance that some links have to deal with?
I'm having some trouble getting full throughput from a GigE pipe. Even in the 100baseTX/FDX down-stream, I'm not getting full link utilization (everything on switches, Cat6509 and 3512XLs). I'm considering increasing MTU sizes to MTU=4096+40, or even larger. Most of the data transmissions fall into the 5KB-50KB range. The site can be considered a large portal. What would be the effect on my upstream? Would it create problems? The only systems that see the Internet are the web-servers (dual NICs).
Current thread:
- PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 14)
- RE: PMTU-D: remember, your load balancer is broken Roeland Meyer (E-mail) (Jun 14)
- RE: PMTU-D: remember, your load balancer is broken John Fraizer (Jun 14)
- Re: PMTU-D: remember, your load balancer is broken Paul Vixie (Jun 17)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 17)
- Re: PMTU-D: remember, your load balancer is broken Bora Akyol (Jun 18)
- Re: PMTU-D: remember, your load balancer is broken Paul Vixie (Jun 19)
- Re: PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Bennett Todd (Jun 14)
- <Possible follow-ups>
- Re: PMTU-D: remember, your load balancer is broken Steven M. Bellovin (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Brett Frankenberger (Jun 14)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)