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Using Jumbo Frames & Gigabit - Actual BPS is slow !

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Anonymous
September 17, 2004 11:39:18 AM

Archived from groups: comp.dcom.lans.ethernet (More info?)

Did a test with Intel Gigabit & 3com 3c2000

Using TCP Client/Server
i get to a max 30mbs (Mega Bytes/Sec.)

We transfer images from a host computer
to 5 client computers , each image is 1024x1024x8bit
what would be the fastest way to transfer this data ?
Anonymous
September 17, 2004 8:00:14 PM

Archived from groups: comp.dcom.lans.ethernet (More info?)

In article <7695359e.0409170639.2f556a4c@posting.google.com>,
Roni Flieswasser <roni@camtek.be> wrote:
:D id a test with Intel Gigabit & 3com 3c2000

:Using TCP Client/Server
:i get to a max 30mbs (Mega Bytes/Sec.)

:We transfer images from a host computer
:to 5 client computers , each image is 1024x1024x8bit
:what would be the fastest way to transfer this data ?

If the same image must go to each computer, you could use
multicast.

You did not say anything about which OS you were using, or about
the architecture of the systems involved, or about how you measured
the throughput. 240 Mbps is not too different from what I would
expect from a standard PC running Windows: to go faster, you
need a better-designed architecture. I would suggest that you
look on tomshardware.com for the article about gigabit networking,
http://www.tomshardware.com/motherboard/20040430/index....

--
Look out, there are llamas!
Anonymous
September 18, 2004 1:43:42 AM

Archived from groups: comp.dcom.lans.ethernet (More info?)

Roni Flieswasser <roni@camtek.be> wrote:
> Did a test with Intel Gigabit & 3com 3c2000

> Using TCP Client/Server
> i get to a max 30mbs (Mega Bytes/Sec.)

> We transfer images from a host computer to 5 client computers , each
> image is 1024x1024x8bit what would be the fastest way to transfer
> this data ?

So, you are going from filesystem to filesystem (perhaps disc to disc)
and getting 30 megabytes per second. What is your local disc
performance? If it is around 30 MB/s you have found your bottleneck.

Or, use something that does not involve the filesystem - eg
http://www.netperf.org/ and see if that goes faster than 30 MB/s.

rick jones
--
oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag
these opinions are mine, all mine; HP might not want them anyway... :) 
feel free to post, OR email to raj in cup.hp.com but NOT BOTH...
Anonymous
September 18, 2004 6:51:54 AM

Archived from groups: comp.dcom.lans.ethernet (More info?)

roni@camtek.be (Roni Flieswasser) wrote in message news:<7695359e.0409170639.2f556a4c@posting.google.com>...

We are using Dual Xeon 3ghz computers with Windows XP
Transfer is done Camera -> DMA -> Memory -> Clients
Clients will process the data and dump it.
!