On Wed, 12 Sep 2007 13:08:06 GMT, AZ Nomad <aznomad.2@PremoveOBthisOX.COM> wrote:
> On 12 Sep 2007 12:52:09 GMT, General Schvantzkoph <schvantzkoph@yahoo.com> wrote:
>
>
>>On Wed, 12 Sep 2007 01:14:07 -0400, Michael Mol wrote:
>
>>> Ignoramus26973 wrote:
>>>> I installed a gigabit network switch and a gigabit enabled laptop wifi
>>>> adapter (with gigabit, obviously, available on ethernet ports only) in
>>>> my house.
>>>>
>>>> Two computers in my home are connected to the switch and one (laptop)
>>>> to the wifi adaptor.
>>>>
>>>> The highest possible speed of a gigabit connection is about 111
>>>> megabytes per second.
>>>>
>>>> Naturally, I did some tests with a noncompressible 1 gigabyte long file
>>>> (fragment of some gzipped file exactly one GB long).
>>>>
>>>> My first test was to scp files from one computer on the switch to
>>>> another. Here, I was disappointed as the highest speed was only 22
>>>> megabytes per second one way and 46 another way. About 20 and 40
>>>> percent of maximum.
>>>>
>>>> Then I tried using HTTP to transfer the same file (both computers are
>>>> webservers). To my huge surprise, it made a world of difference and the
>>>> transfer speed was 111 or so megabytes per second.
>>>>
>>>> So, now I have a dilemma, I have a fast pipe, but scp is not fast
>>>> enough (given my CPU) to encrypt/decrypt so much data.
>>>>
>>>> I tried something else, which is doing wc -l on a NFS mounted drive
>>>> (same two computers). It was UNBELIEVABLY slow and the load average on
>>>> the NFS server shot WAY up. Transferring a 336 MB file took 157
>>>> seconds, or about e megabytes per second (vs 111 mbps that I achieved
>>>> with HTTP).
>>>
>>> So, about 2.7 MB/s? :-)
>>>
>>>
>>>> So, the conclusion is, HTTP is fast (no wonder), SSH is "medium", and
>>>> NFS is "slow, very bad".
>>>
>>> I ran into a similar problem with NFS ages back. Turns out you can
>>> largely fix it by configuring NFS to increase the packet size. Been a
>>> few years since I did anything with NFS, though, so you'll have to look
>>> through the docs. I hear they use it in computer clusters, so it can't
>>> be slow in *all* cases.
>
>>How do you configure NFS to increase the packet size? Also are you
>>talking about NFS V4 or V3?
>
> when you mount it. Why didn't you just google for "nfs packet size"?

When I configure rsize and wsize, the mount fails for some reason, it
does not like these options, even if set at 4192. Client is Fedore 7,
server is Fedora Core 6.

i