nanog mailing list archives
Re: Thoughts on increasing MTUs on the internet
From: Douglas Otis <dotis () mail-abuse org>
Date: Sat, 14 Apr 2007 10:22:16 -0700
On Apr 13, 2007, at 4:55 PM, Fred Baker wrote:
The biggest value in real practice is IMHO that the end systems deal with a lower interrupt rate when moving the same amount of data. That said, some who are asking about larger MTUs are asking for values so large that CRC schemes lose their value in error detection, and they find themselves looking at higher layer FEC technologies to make up for the issue. Given that there is an equipment cost related to larger MTUs, I believe that there is such a thing as an MTU that is impractical.1500 byte MTUs in fact work. I'm all for 9K MTUs, and would recommend them. I don't see the point of 65K MTUs.
Keep in mind that a 9KB MTU still reduces the Ethernet CRC effectiveness by a fair amount. Adoption of CRC32c by SCTP and iSCSI has a larger Hamming distance restoring the detection rates for Jumbo packets.
-Doug
Current thread:
- Re: Thoughts on increasing MTUs on the internet, (continued)
- Re: Thoughts on increasing MTUs on the internet Daniel Senie (Apr 12)
- Re: Thoughts on increasing MTUs on the internet David W. Hankins (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Perry Lorier (Apr 12)
- Re: Thoughts on increasing MTUs on the internet Simon Leinen (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Fred Baker (Apr 13)
- 1500 does not work: Thoughts on increasing MTUs on the internet Peter Dambier (Apr 14)
- Re: 1500 does not work: Thoughts on increasing MTUs on the internet Marshall Eubanks (Apr 14)
- Re: 1500 does not work: Thoughts on increasing MTUs on the internet Petri Helenius (Apr 14)
- Re: 1500 does not work: Thoughts on increasing MTUs on the internet Marshall Eubanks (Apr 15)
- Re: 1500 does not work: Thoughts on increasing MTUs on the internet Petri Helenius (Apr 15)
- Re: Thoughts on increasing MTUs on the internet Fred Baker (Apr 13)
- Re: Thoughts on increasing MTUs on the internet Douglas Otis (Apr 14)
- Re: Thoughts on increasing MTUs on the internet Iljitsch van Beijnum (Apr 14)
- Re: Thoughts on increasing MTUs on the internet Bill Stewart (Apr 14)
- Re: Thoughts on increasing MTUs on the internet Randy Bush (Apr 14)
- Re: Thoughts on increasing MTUs on the internet Stephen Sprunk (Apr 14)
- Re: Thoughts on increasing MTUs on the internet Douglas Otis (Apr 14)