RE: [H] Gigabit Network Speeds
Yup, 3X speed increase is reasonable. 007. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of James Maki Sent: Wednesday, July 13, 2005 11:24 AM To: 'The Hardware List' Subject: [H] Gigabit Network Speeds I have a home network connected via a gigabit capable router. I recently added a second computer equipped with a gigabit network adapter, giving me two gigabit equipped computer and two 10/100 equipped computers. I decided to do an informal speed test, copying a 730 MB file from 100--1000 and from 1000--1000 equipped systems. The 10/100 connection gave a time of 78 seconds and the gigabit connection gave a time of 27 seconds, about 2.6x faster. Now, I wasn't expecting 10x faster, and in no way optimized the experiment, but is this a reasonable speed increase? Just curious. Jim Maki [EMAIL PROTECTED]
RE: [H] Gigabit Network Speeds
-Original Message- From: W. D. At 10:24 7/13/2005, James Maki, wrote: The 10/100 connection gave a time of 78 seconds and the gigabit connection gave a time of 27 seconds, about 2.6x faster. Now, I wasn't expecting 10x faster, and in no way optimized the experiment, but is this a reasonable speed increase? Just curious. Jim Maki [EMAIL PROTECTED] Isn't hard disk throughput a limiting factor here? Since theoretical throughput and actual throughput don't seem to correspond in any real world examples, I suppose it could. I will have to re-do the test with more stringent conditions. The 10/100--1000 was from an ATA100 to an IDE ATA133 RAID0. I then went from the RAID0 to a SATA3 RAID0 with a gigabit connection. Lots of different standards. I guess I was assuming (and I know that is a dangerous thing to do) that the LAN would be the limiting factor. Your comment gives me pause. Do you have any web site references that might shed some light on the different standards and actual expected throughput (ATA100 vs ATA133 vs RAID0 vs SATA3, etc.)? I tried a quick google and came up with lots of ads for the hardware and little on testing results. Jim [EMAIL PROTECTED]
RE: [H] Gigabit Network Speeds
I just read something today or yesterday talking about testing gigabit speeds and they were saying that you really needed 64-bit PCI adapters and a good router to achieve higher speeds. I can not remember where I read that though. Sorry. Bobby -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Maki Sent: Wednesday, July 13, 2005 2:06 PM To: 'The Hardware List' Subject: RE: [H] Gigabit Network Speeds -Original Message- From: W. D. At 10:24 7/13/2005, James Maki, wrote: The 10/100 connection gave a time of 78 seconds and the gigabit connection gave a time of 27 seconds, about 2.6x faster. Now, I wasn't expecting 10x faster, and in no way optimized the experiment, but is this a reasonable speed increase? Just curious. Jim Maki [EMAIL PROTECTED] Isn't hard disk throughput a limiting factor here? Since theoretical throughput and actual throughput don't seem to correspond in any real world examples, I suppose it could. I will have to re-do the test with more stringent conditions. The 10/100--1000 was from an ATA100 to an IDE ATA133 RAID0. I then went from the RAID0 to a SATA3 RAID0 with a gigabit connection. Lots of different standards. I guess I was assuming (and I know that is a dangerous thing to do) that the LAN would be the limiting factor. Your comment gives me pause. Do you have any web site references that might shed some light on the different standards and actual expected throughput (ATA100 vs ATA133 vs RAID0 vs SATA3, etc.)? I tried a quick google and came up with lots of ads for the hardware and little on testing results. Jim [EMAIL PROTECTED]
Re: [H] Gigabit Network Speeds
At 09:28 AM 7/13/2005, you wrote: At 10:24 7/13/2005, James Maki, wrote: I have a home network connected via a gigabit capable router. I recently added a second computer equipped with a gigabit network adapter, giving me two gigabit equipped computer and two 10/100 equipped computers. I decided to do an informal speed test, copying a 730 MB file from 100--1000 and from 1000--1000 equipped systems. The 10/100 connection gave a time of 78 seconds and the gigabit connection gave a time of 27 seconds, about 2.6x faster. Now, I wasn't expecting 10x faster, and in no way optimized the experiment, but is this a reasonable speed increase? Just curious. Jim Maki [EMAIL PROTECTED] I have had a Gbit network for about 8 months. Two PCs with onboard Intel Gbit NICs, and one PC with a SMP Gbit nic, all plugged into a 5 port Gbit switch using CAT7. The switch is plugged into a Netgear 314 10/100 router. Everything else on the LAN plugs into a Dlink 10/100 8 port switch with CAT 5e. Both switches plug into the Netgear Router. When I first set mine up I had the same question. Why was it so slow. I called SMP, I tried all sorts of tests, including running with the two Intel NICs ONLY through the SMP Gbit switch, with nothing hooked up to anything but Gbit hardware = No router. That made it go faster but nothing gave me speeds even approaching 1000 megabit Both the switch, and my NICs, support Jumbo Frames to 9014 bytes, but enabling this makes the connection problematic and does nothing for performance. I have read that Jumbo frames will only work on a pure GB network, so buying a router for this feature, on a mixed network, is a waste of money. I never figured out, or found a plausible explanation of why Gbit runs so slow, relative to it's specifications. At this point, I have just accepted it. GB networks appear to be vapor ware.
RE: [H] Gigabit Network Speeds
What are the fast hard drives at these days for sustained reads? 40 MB/s? 40MB x 8 = 320 mb/s So there is a bottle neck right there for how fast your computer can read things into the network. Then there is the bottle neck on the other side with the other computer writing. When the computer is receiving packets it cant handle at the moment it sends a back off packet to the other computer to slow down the transfer a bit. I wonder if you sniff the network and see how many of the back offs your getting. Plus on top of that what is the overhead of tcp/ip anyways 20% or something like that? -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Winterlight Sent: Wednesday, July 13, 2005 11:45 AM To: The Hardware List Subject: Re: [H] Gigabit Network Speeds At 09:28 AM 7/13/2005, you wrote: At 10:24 7/13/2005, James Maki, wrote: I have a home network connected via a gigabit capable router. I recently added a second computer equipped with a gigabit network adapter, giving me two gigabit equipped computer and two 10/100 equipped computers. I decided to do an informal speed test, copying a 730 MB file from 100--1000 and from 1000--1000 equipped systems. The 10/100 connection gave a time of 78 seconds and the gigabit connection gave a time of 27 seconds, about 2.6x faster. Now, I wasn't expecting 10x faster, and in no way optimized the experiment, but is this a reasonable speed increase? Just curious. Jim Maki [EMAIL PROTECTED] I have had a Gbit network for about 8 months. Two PCs with onboard Intel Gbit NICs, and one PC with a SMP Gbit nic, all plugged into a 5 port Gbit switch using CAT7. The switch is plugged into a Netgear 314 10/100 router. Everything else on the LAN plugs into a Dlink 10/100 8 port switch with CAT 5e. Both switches plug into the Netgear Router. When I first set mine up I had the same question. Why was it so slow. I called SMP, I tried all sorts of tests, including running with the two Intel NICs ONLY through the SMP Gbit switch, with nothing hooked up to anything but Gbit hardware = No router. That made it go faster but nothing gave me speeds even approaching 1000 megabit Both the switch, and my NICs, support Jumbo Frames to 9014 bytes, but enabling this makes the connection problematic and does nothing for performance. I have read that Jumbo frames will only work on a pure GB network, so buying a router for this feature, on a mixed network, is a waste of money. I never figured out, or found a plausible explanation of why Gbit runs so slow, relative to it's specifications. At this point, I have just accepted it. GB networks appear to be vapor ware.
Re: [H] Gigabit Network Speeds
At 11:48 AM 7/13/2005, you wrote: I find that I only get 7MB or so ftp'ing files from our XServe to my laptop and that's on a 100mb connection. I blame the slow ass hard drive in my Toshiba. Winterlight wrote: well this PC is a dual 3.06 Xeon with Raptor drives and 4GB of RAM and a onboard Intel Gbit NIC. The box it is receiving files from is a P4 3.4 ..2GB ram and Maxtor 72K SATAs 16MB cache with the same onboard Intel Gbit NIC. I don't think it is the PC slowing things down. For one thing both of these PCs have large RAM Drives. I can copy a 500MB file from one to the other without ever writing to a hard drive and not achieve any better rate then if I am copying to the drives.
Re: [H] Gigabit Network Speeds
7MB on FTP sounds a little low, but not a lot. Max would be 12.5MByte/sec, and normal max would be about 11MByte/sec. Heck, I can get 8.5MBytes/sec going through our 100Mbit Linux router (4 port). Over GigaBit (HP Switches, I am getting 12-14MByte/sec using SCP, and a copy over NFS is even faster: [EMAIL PROTECTED]:/tmp$ time cp /net/meneldor/home/hmcgregor/greg-1.tif . real0m25.162s user0m0.102s sys 0m11.862s 661217378 greg-1.tif That's about 25MBytes/sec Gigabit's max is 125MBytes/sec, but PCI bus issues, HD speeds, etc, all bring it down. I have found GigE to the desktop to be worth it, as it's faster than 100Mbit. Modern PC systems can't handle it. Heck some of our servers don't have 64 bit PCI yet. Harry On Wed, 2005-07-13 at 14:48 -0400, Ben Ruset wrote: I find that I only get 7MB or so ftp'ing files from our XServe to my laptop and that's on a 100mb connection. I blame the slow ass hard drive in my Toshiba. Winterlight wrote: I have had a Gbit network for about 8 months. Two PCs with onboard Intel Gbit NICs, and one PC with a SMP Gbit nic, all plugged into a 5 port Gbit switch using CAT7. The switch is plugged into a Netgear 314 10/100 router. Everything else on the LAN plugs into a Dlink 10/100 8 port switch with CAT 5e. Both switches plug into the Netgear Router. When I first set mine up I had the same question. Why was it so slow. I called SMP, I tried all sorts of tests, including running with the two Intel NICs ONLY through the SMP Gbit switch, with nothing hooked up to anything but Gbit hardware = No router. That made it go faster but nothing gave me speeds even approaching 1000 megabit Both the switch, and my NICs, support Jumbo Frames to 9014 bytes, but enabling this makes the connection problematic and does nothing for performance. I have read that Jumbo frames will only work on a pure GB network, so buying a router for this feature, on a mixed network, is a waste of money. I never figured out, or found a plausible explanation of why Gbit runs so slow, relative to it's specifications. At this point, I have just accepted it. GB networks appear to be vapor ware. -- Harry McGregor [EMAIL PROTECTED] Open Source Education Foundation
Re: [H] Gigabit Network Speeds
Our network is shit, though. Cat5e cabling, but to Linksys Gigabit switches, and likely a lot of stupid broadcast crap. Harry McGregor wrote: 7MB on FTP sounds a little low, but not a lot. Max would be 12.5MByte/sec, and normal max would be about 11MByte/sec.
