nanog mailing list archives
RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. )
From: "Roeland M.J. Meyer" <rmeyer () mhsc com>
Date: Mon, 19 Jun 2000 09:51:01 -0700
sthaug () nethelp no: Monday, June 19, 2000 9:25 AM
Actually, my testing shows a falure to utilize even 100baseTX fully. Even in a switched FDX environment (no collisions) I
can't
achieve line rate without bumping the packet size up.
Considering
that the smallest box is a quad-CPU SMP machine (550Mhz), I
don't
think that there is a CPU shortage <grin>.The your problem probably lies elsewhere. A decent operating
system
(e.g. FreeBSD) can do line rate on 100baseTX with something
along the
line of a Pentium-166. Not exactly a very powerful machine by
current
standards. (And btw this was measured three years ago...)
Steinar, I should have re-caveated, for your benefit. I am not testing with a bazillion-byte file. I am testing with query/response against a RDBMS host. IOW, a typically real-world(tm) practical application. The responses range from 3-50KB, with anomalies out to 100KB. The slow-start algorithm has been identified as the real culprit. Not wanting to carve up all the IP stacks, I bump MTU up to effectively reduce the impact of the slow-start algorithm (which is obsolete in a switched environment anyway, worse than useless). Measurments are taken at the RDBMS host, as well as the client.
Current thread:
- Re: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner to reston VA. ) Vadim Antonov (Jun 19)
- <Possible follow-ups>
- Re: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner to reston VA. ) Richard A. Steenbergen (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Roeland Meyer (E-mail) (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) sthaug (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Roeland M.J. Meyer (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Marc Slemko (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner torestonVA. ) Roeland Meyer (E-mail) (Jun 19)
- RE: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Roeland Meyer (E-mail) (Jun 19)
- Re: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Bennett Todd (Jun 19)
- Re: Jumbo Frames (was Re: MAE-EAST Moving? from Tysons corner toreston VA. ) Stephen Sprunk (Jun 19)