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| Private networking help https://forum.linode.com/viewtopic.php?f=19&t=6704 |
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| Author: | chadcf [ Mon Feb 14, 2011 12:19 am ] |
| Post subject: | Private networking help |
Hi all, I'm trying to do some web server benchmarking to get an idea of various configurations and their relative performance for an app. I have two linode's set up (set up the second one basically to get fast networking to really be able to test the server), but found that the throughput was topping out at around 45 kbytes/sec. So I enabled private networking on both linode's and followed the config guide to do the static IP allocation. For both linodes I've configured /etc/network/interfaces to have eth0 be the public IP, and eth0:0 the private IP. I added the options rotate to /etc/resolv.conf as well, then restarted networking (and of course, restarted both servers after enabling private networking). However when I test this with my private IP's I get: Code: ------------------------------------------------------------ I can't imagine this is actually using the private network as 45 Mbit/sec in a datacenter would be ridiculous. Is there something else I need to do, or something to check?[/code] |
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| Author: | db3l [ Mon Feb 14, 2011 1:39 am ] |
| Post subject: | |
By default the virtual ethernet interface of a Linode is bandwidth limited to 50Mbps outbound (inbound doesn't appear to have a limit). This is on the virtual interface in general, so affects both public and private address space. Not sure why you'd only be getting 45Kbytes/s on the public interface. You may not hit 50Mbps easily with just one sink depending on latency, but that seems really low. You can open a support ticket to have the limit increased (to 100Mbps), but in my experience are asked to explain your need and to demonstrate that you can utilize the higher rate. -- David |
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| Author: | chadcf [ Mon Feb 14, 2011 2:00 am ] |
| Post subject: | |
db3l wrote: By default the virtual ethernet interface of a Linode is bandwidth limited to 50Mbps outbound (inbound doesn't appear to have a limit). This is on the virtual interface in general, so affects both public and private address space.
Not sure why you'd only be getting 45Kbytes/s on the public interface. You may not hit 50Mbps easily with just one sink depending on latency, but that seems really low. You can open a support ticket to have the limit increased (to 100Mbps), but in my experience are asked to explain your need and to demonstrate that you can utilize the higher rate. -- David Are you sure about that? 50Mb is largely what you can get through the public interface no? I can't imagine linode would offer private networking with no greater speed than the outgoing data center pipe, it would make doing any sort of clustering or load balancing much less useful... I also found this post from just a few days ago and he managed to get over 1 Gb per second on the private network... http://alittletothewright.com/index.php/2011/02/linode-private-network-speed-tests/ |
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| Author: | hoopycat [ Mon Feb 14, 2011 9:33 am ] |
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From the page you cited: Quote: One thing to note: The private interface is an alias on the primary interface. This means that the default cap on outbound bandwidth (which exists to prevent you from accidentally blowing through all your transfer in a couple hours) applies to the private interface as well. The default cap is 50Mbit/sec, but all it takes is a ticket to get that bumped up if needed.
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| Author: | carmp3fan [ Mon Feb 14, 2011 10:21 am ] |
| Post subject: | |
chadcf wrote: I can't imagine linode would offer private networking with no greater speed than the outgoing data center pipe, it would make doing any sort of clustering or load balancing much less useful...
One of the main reasons to use private networking is not for speed between servers, it is to reduce the amount of bandwidth used when talking between servers in the same datacenter. |
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| Author: | Guspaz [ Tue Feb 15, 2011 12:13 pm ] |
| Post subject: | |
If you need it to be faster, you can get the limit raised. When I was migrating to a new Linode, I filed a ticket, and they bumped the limit to 150Mbps. I updated the ticket when I was done to get it dropped back down to 50Mbps. |
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