2.5 Meg transfers on 100Mb switched network?

I'm doing some nfs file transfers from one box to another over a
CAT5-to-switch-to-CAT5 connection, both boxes connected at 100 Mb. I've
noticed some of the files actually go at 2.5 Meg per second. Isn't that two
and a half times the actual effective rate of 1 Meg per sec that this sort
of connection should have? How is it happening?

My guess is nfs is using compression of some sort, but I didn't think nfs
had compression...

"no body" <no-one@no-where.com> wrote in message
news:sl_Ja.7155$Bg.5595@rwcrnsc54...
> I'm doing some nfs file transfers from one box to another over a
> CAT5-to-switch-to-CAT5 connection, both boxes connected at 100 Mb. I've
> noticed some of the files actually go at 2.5 Meg per second. Isn't that
two
> and a half times the actual effective rate of 1 Meg per sec that this sort
> of connection should have? How is it happening?
>
> My guess is nfs is using compression of some sort, but I didn't think nfs
> had compression...
>
>

Actuallt if yea take 100Mbits / (8 bits/byte + say 2 for overhead) =
10MB/sec

With a 10Mbit ethernet yea can estimate 1MByte top speed in the same manner.

Hope this helped.

no body wrote:
>
> I'm doing some nfs file transfers from one box to another over a
> CAT5-to-switch-to-CAT5 connection, both boxes connected at 100 Mb. I've
> noticed some of the files actually go at 2.5 Meg per second. Isn't that two
> and a half times the actual effective rate of 1 Meg per sec that this sort
> of connection should have? How is it happening?

No, it's rather less than one quarter of the theoretical maximum rate of
around 11-12MB/s. It suggests that your network connection isn't very
efficient, but maybe there is other traffic contending.

Regards, Ian

no body (no-one@no-where.com) wrote:
: I'm doing some nfs file transfers from one box to another over a
: CAT5-to-switch-to-CAT5 connection, both boxes connected at 100 Mb. I've
: noticed some of the files actually go at 2.5 Meg per second. Isn't that two
: and a half times the actual effective rate of 1 Meg per sec that this sort
: of connection should have? How is it happening?

: My guess is nfs is using compression of some sort, but I didn't think nfs
: had compression...

It is my understanding that NFS does not do compression. But your
1MB/s is 10base connection. If you play with window size options
under NFS, you should be able to get 4 - 6 MB/s on 100base network.