Old SUN NFS performance papers.

David Gilbert dgilbert at dclg.ca
Tue Jan 20 12:56:32 PST 2004

>>>>> "Eric" == Eric Anderson <anderson at centtech.com> writes:

Eric> Steve Francis wrote:
>> Eric Anderson wrote:
>>>  I wasn't even sure where to start or stop snipping on this mail,
>>> since it is all good stuff - so I didn't. :) Thanks for the great
>>> info, and good explanations..  NFS+TCP is very nice, but I do
>>> believe the UDP transport was faster on a handful of tests
>>> (however I typically force use of TCP when I can)..
>>> One question - what does net.inet.ip.check_interface=0 do?

>> makes FreeBSD not care if the interface a response comes in on is
>> the same as the one a request did. Helps only if network topology
>> is funky.

Eric> That's handy for a network like I have.  What would also be
Eric> handy, is a sysctl like that for the client side - that tells
Eric> FreeBSD to ignore the fact that a response is coming from a
Eric> different IP than what it sent the request to.  Yes, I know this
Eric> is a security issue, and yes I understand the ramifications.
Eric> Nevertheless, I need it - unless there is a way to tell redhat
Eric> and solaris to always answer on the same interface the request
Eric> came in on..

Another situation I've found it useful for is my laptop.  As long as
the IP it comes up on (via DHCP) is in exports, moving from one part
of the lan to another works.  It takes a minute or two, but the laptop
will reopen the TCP connection and the mount comes back alive.


|David Gilbert, Independent Contractor.       | Two things can only be     |
|Mail:       dave at daveg.ca                    |  equal if and only if they |
|http://daveg.ca                              |   are precisely opposite.  |

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