Message boards :
Number crunching :
Gigabit up the hill
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Author | Message |
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Dragokatzov Send message Joined: 6 May 00 Posts: 45 Credit: 15,742,981 RAC: 5 |
I would say it is time to get this thing rolling. I would also like to add the following suggestion of adding a speed cap of 100KB/s or even just 50KB/s. I remember when SETI got the 100Mbps link running, and thought why it was necessary to download a 366KB WU at 700KB/s? These are not large pieces of data, and I believe a speed cap like this would help make better use of the bandwidth available. Even an Astropulse unit would download in 2 minutes and 45 seconds at 50KB/s. Until we get cards that can do a work unit that fast, I don't think there is any need to download at that speed. I am aware of GPUUG's efforts, but none seem to focus on the Gigabit cause I have looked for a fundraiser campaign or something to donate for the fiber line but I can not find it. Is there one? |
HAL9000 Send message Joined: 11 Sep 99 Posts: 6534 Credit: 196,805,888 RAC: 57 |
I would say it is time to get this thing rolling. I would also like to add the following suggestion of adding a speed cap of 100KB/s or even just 50KB/s. I remember when SETI got the 100Mbps link running, and thought why it was necessary to download a 366KB WU at 700KB/s? These are not large pieces of data, and I believe a speed cap like this would help make better use of the bandwidth available. Even an Astropulse unit would download in 2 minutes and 45 seconds at 50KB/s. Until we get cards that can do a work unit that fast, I don't think there is any need to download at that speed. I am aware of GPUUG's efforts, but none seem to focus on the Gigabit cause It is a primarily a campus political/bureaucratic issue. Also the guys in the lab are looking to move their servers "down the hill" to some sort of campus server room. I think it was Technical News Where this information was posted recently. SETI@home classic workunits: 93,865 CPU time: 863,447 hours Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[ |
Dragokatzov Send message Joined: 6 May 00 Posts: 45 Credit: 15,742,981 RAC: 5 |
Thanks for the clarification |
Richard Haselgrove Send message Joined: 4 Jul 99 Posts: 14656 Credit: 200,643,578 RAC: 874 |
I think it was Technical News Where this information was posted recently. Yes, it was the opening post in Upgrades at the end of January. |
Cosmic_Ocean Send message Joined: 23 Dec 00 Posts: 3027 Credit: 13,516,867 RAC: 13 |
There was a time a while back when downloads were capped to keep one person from hogging all of it. I know this because when the cricket graph was only at about 50mbit, I would get a batch of APs and each one would only run about 75-100k/sec. That was years ago though. Now that the pipe stays maxed, we can totally get rid of the cap (I think it is actually gone already), because no one person can get more than 15-20k/sec out of a single transfer anyway. However, a few weeks ago when there was some sort of problem and the pipe was not maxed-out, I was sent a _2 AP and it downloaded in 4 seconds (2MB/sec). That tells me that there is no longer a transfer cap. We just need a bigger pipe. Moving the servers to the 24-hour staffed co-location facility 2 miles "down the hill" will enable us to hook up to the Hurricane Electronics router and have a gigabit connection to the world. That should smooth things out quite nicely. But again, that's some more politics and tons of red-tape that need to be negotiated through, but this one seems way more likely to happen than to convince the governing body to run a new 2.5-mile buried fiber link up the hill--even if the cost for that gets donated and won't technically cost them anything, they still don't want to do it. Linux laptop: record uptime: 1511d 20h 19m (ended due to the power brick giving-up) |
kittyman Send message Joined: 9 Jul 00 Posts: 51469 Credit: 1,018,363,574 RAC: 1,004 |
Pardon me if I am mistaken, but I believe there is already fibre up the hill. It is simply campus politics that is preventing Seti from getting access to it. It would be a small matter, I believe, to get the project any hardware bits necessary to support the access, if granted. "Freedom is just Chaos, with better lighting." Alan Dean Foster |
Cosmic_Ocean Send message Joined: 23 Dec 00 Posts: 3027 Credit: 13,516,867 RAC: 13 |
Pardon me if I am mistaken, but I believe there is already fibre up the hill. It is simply campus politics that is preventing Seti from getting access to it. My understanding is there is already gigabit fiber running up the hill, but only one link. SAH is allowed 100mbit of it. Before, I thought I had remembered hearing that there were two links going up the hill. The one for SAH was a really old hybrid fiber/copper cable that could only do 100mbit. Then there was something else about the router down on campus at the end of this hybrid cable did not have gigabit capability. The politics come into play with upgrading the equipment down on campus, and/or running a new fiber line up the hill. I don't have the time so read through 5 years worth of tech news posts, but I have retained some bits and pieces of information in a back corner of my brain. The co-lo is probably the simplest solution, though I'm sure they would prefer to be able to keep all the servers in the lab, but when one of them gets hung up and needs a power cycle, the 24/7-staffed co-lo can do that within minutes instead of sometime the next day. Linux laptop: record uptime: 1511d 20h 19m (ended due to the power brick giving-up) |
Josef W. Segur Send message Joined: 30 Oct 99 Posts: 4504 Credit: 1,414,761 RAC: 0 |
My understanding is that the HE data goes through the same 100Mbps copper line as was used when Cogent was the ISP. The project main page, forums, etc. which are served by Thinman go through the 1GB fiber which was put in to serve all of the Space Sciences Laboratory, and the project can also use that path for other non-BOINC transfers. The gigabitethernet2_3 graphed by Cricket is one of 48 interfaces to the INR-250 campus router, and the donated Cisco router/switch at the head of that link is also capable of gigabit ethernet. The line down the hill isn't, and sharing with 47 other interfaces at the router may mean that the next few hops would also need some serious upgrade. Back in 2006 and 2007 when there was a budget line item of $80000 to upgrade the line it was just a rough guess, and since participants didn't donate generously enough... Joe |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 30740 Credit: 53,134,872 RAC: 32 |
http://www.net.berkeley.edu/netinfo/newmaps/ucb-border.html This is the old topology. Since the fibers were pulled both SSL & Seti@Home have changed. http://www.net.berkeley.edu/netinfo/newmaps/campus-topology.jpg This shows a more current picture, but the Seti@Home link to HE is not depicted seperately. This cricket http://fragment1.berkeley.edu/newcricket/grapher.cgi?target=/router-interfaces/inr-201/gigabitethernet3_10&ranges=d%3Aw&view=Octets shows the next hop on campus for our data, and it has other campus data mixed at this point and is on http://www.net.berkeley.edu/newcricket/cricket/inr-201.html this router. This cricket http://fragment1.berkeley.edu/newcricket/grapher.cgi?target=%2Frouter-interfaces%2Finr-001-sut%2Fxe-4_0_0;ranges=m;view=Octets carries our data out to PAIX where HE picks it up and this is on http://www.net.berkeley.edu/newcricket/cricket/inr-001-sut.html this router. Note this is a 10Gig connection. Campus politics ($$$$/byte) are the 100 Meg limitation. |
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