fast cable router | Off Topic | unofficial empeg BBS

Quick Links: Empeg FAQ | RioCar.Org | Hijack | BigDisk Builder | jEmplode | emphatic
Repairs: Repairs

You are not logged in. [Log In] empegbbs.com » Forums » General Discussion » Off Topic » fast cable router

Page 2 of 2

2

Topic Options

#304446 - 30/11/2007 19:05 Re: fast cable router [Re: drakino]
mlord carpal tunnel Registered: 29/08/2000 Posts: 14491 Loc: Canada	Quote: Quote: That would be true, if the switches and interfaces were all powered off between packets. Dream on. Looks lke the IEEE is working on this based on this story. While it doesn't completely power down, the idea is to run the link at the minimum speed needed, so when idle the ports are throttled down to 10mbit. Yes, we've been discussing such on various kernel lists recently. But it does tend to collide with the desire for jumbo frames, which are not normally supported below GigE. Cheers
Top

#304447 - 30/11/2007 19:07 Re: fast cable router [Re: drakino]
mlord carpal tunnel Registered: 29/08/2000 Posts: 14491 Loc: Canada	Quote: Quote: That would be true, if the switches and interfaces were all powered off between packets. Dream on. Looks lke the IEEE is working on this based on this story. While it doesn't completely power down, the idea is to run the link at the minimum speed needed, so when idle the ports are throttled down to 10mbit. I'm also wondering about your GigE power usage numbers of 1w, as I can find several product announcements of newer lower power GigE chips, with one of those dating back to 2002. Are manufacturers just being really slow on switching to new chips, or being cheep? The IEEE article you linked to above suggests around 4W per GigE port.
Top

#304448 - 30/11/2007 19:10 Re: fast cable router [Re: mlord]
mlord carpal tunnel Registered: 29/08/2000 Posts: 14491 Loc: Canada	Quote: By comparison, the new 24-port 10/100 switch that we just installed here consumes a mere 3W total with most ports idle, and a max of only 6.5W with all 24 ports active. Speaking of which.. anyone want a used 16-port 10/100 "desktop" switch, cheap?
Top

#304449 - 30/11/2007 19:46 Re: fast cable router [Re: mlord]
drakino carpal tunnel Registered: 08/06/1999 Posts: 7868	Quote: Quote: I'm also wondering about your GigE power usage numbers of 1w, as I can find several product announcements of newer lower power GigE chips, with one of those dating back to 2002. Are manufacturers just being really slow on switching to new chips, or being cheep? The IEEE article you linked to above suggests around 4W per GigE port. Thats what is so confusing. These numbers are all over the place, with manufacturers saying .6W in 2002, but IEEE saying a wildly different 4W in 2007, and your own estimate at 1W.
Top

#304450 - 30/11/2007 19:55 Re: fast cable router [Re: drakino]
wfaulk carpal tunnel Registered: 25/12/2000 Posts: 16706 Loc: Raleigh, NC US	Most of the gigE switches on Newegg I've found power specs for seem to fall right around the 1W per port arena. Of course, those are max consumption specs. I have no idea how much they might consume during downtime. _________________________ Bitt Faulk
Top

#304451 - 01/12/2007 15:50 Re: fast cable router [Re: mlord]
mlord carpal tunnel Registered: 29/08/2000 Posts: 14491 Loc: Canada	Quote: Quote: Quote: Google for Dr.TCP, and install/run it on those old boxes. It's probably just a low MTU on Win2000 or something. That did it. I set the MTU to 1500 and the RWIN to 192096, as suggested by dslreports.com, and the speed jumped to 15Mbits. Thanks to everyone. Pca changed RWIN to 384192 and the speed went to 16.5Mbits. Making it even larger slowed it down again, so I went back The equivalent settings for the Kubuntu box are under /proc/sys/net/ipv4/ : echo 1 > /proc/sys/net/ipv4/tcp_window_scaling echo "4096 16384 65536" > /proc/sys/net/ipv4/tcp_rmem Larger values for that third parameter (65536) will give similar behaviour to the 192096 or 384192 numbers you used for Win2000. You can make the changes permanent by also entering them into /etc/sysctl.conf, like this: net.ipv4.tcp_window_scaling=1 net.ipv4.tcp_rmem=4096 16384 65536 Mmm.. corrections to my original posting are show above in green. Basically it should be rmem instead of wmem above.
Top

#304452 - 02/12/2007 16:12 Re: fast cable router [Re: pca]
Jehovah new poster Registered: 04/02/2007 Posts: 21	Cable router? One word (maybe two): Porter-Cable 21,000 RPM
Top

Page 2 of 2

2

View All Topics