[NCLUG] measuring LAN connection speed

[Daniel Herrington]

Thanks for the help, everyone.  I used a simple nfs mount, then did a
"cat /dev/zero > tmp" and "cat tmp > /dev/null", dividing the amount
of MB transferred by the amount of time it took.  I get a consistent
9-10MB/s either direction over my LAN, which is great!  Time to start
capturing and editing some video!

Regards,
   Daniel



=> Replying to Tkil's message, "Re: [NCLUG] measuring LAN connection speed" (Jul 20):
 > >>>>> "Daniel" == Daniel Herrington <danielh at ftc.agilent.com> writes:
 > 
 > Daniel> What command can I use to measure the speed of my 10/100 cards
 > Daniel> & switch?  
 > 
 > ftp binary transfers are the quick and dirty way to do it.  the
 > "/dev/zero" thing is to make up for slow disk subsystems; on my VIA
 > boards (with DMA currently disabled, grumble) i rarely get more than
 > 3MB/s off the hard disk.
 > 
 > Daniel> I seem to recall something about catting to /dev/null from the
 > Daniel> opposite machine's disk, and from /dev/zero or something to
 > Daniel> the other machine's disk.
 > 
 > if you're using NFS to share the disk, this technique should work.
 > i'd be mildly surprised if NFS can squeeze out the same throughput of
 > TCP over the same network, though.
 > 
 > Daniel> I'm wanting to set up a file server that will have decent disk
 > Daniel> speed for video capture from another machine (which has an old
 > Daniel> and slow drive/controller).  I need at least 5-6MB/sec, so
 > Daniel> 10-BaseT won't cut it.  I need to verify that I can get that
 > Daniel> kind of speed with my 10/100 stuff and nfs.
 > 
 > a similar thread popped up on the BLUG (boulder, co, LUG) list a few
 > weeks back.  take a look at:
 > 
 >    http://archive.lug.boulder.co.us/bymonth/2001.07/msg00116.html
 > 
 > and subsequent articles in that thread.  it will probably answer most
 > of your questions.
 > 
 > t.
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