[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Ramfs and Cachless Networking.

On Wed, Sep 26, 2001 at 10:44:05AM -0400, igor@ta2000.dyndns.org wrote:
> I tried to use scp, but I guess it was caching the info somewhere because I 
> was getting the same transfer speeds as from HDs.

That's a good possibility.  Your test could easily be corrupted on
either side - the send-from-disk could have been thrown off by the OS
caching the files in RAM and the send-from-RAM could be thrown off if
the ramfs had been swapped out.  Linux uses both caching and virtual
memory pretty aggressively.

OTOH, as a previous poster suggested, it seems more likely that your
hard disk is just faster than your network connection, in which case
I would expect to get the same results either way.

> Question: Can I tweak scp or use something else to send files directly from 
> RAM of one computer into another as fast as possible ?

Why does it need to come out of RAM?  Make it up on the fly - pipe
/dev/urandom or the output of `while /bin/true ; do echo 0 ; done`
across the network and you don't have to worry about the data being

When we reduce our own liberties to stop terrorism, the terrorists
have already won. - reverius

Reply to: