[Beowulf] Is it necessary to increase size of the ARP cache?
bart at attglobal.net
Thu May 27 21:06:58 PDT 2010
You could always write a script to capture the arp caches of some of
your machines over time. If your caches are constantly full, then
increasing might be warranted. You also might want to consider looking
at your arp cache timeout value since all that new space won't matter if
it's gone before you need to use it.
On 5/27/2010 3:52 PM, Greg Lindahl wrote:
> On Thu, May 27, 2010 at 05:25:56PM -0500, Rahul Nabar wrote:
>> But is there a way of knowing from logs etc. if this fix is indeed needed
>> for my network?
> If you tcpdump and see a crapload of arp broadcasts, you know.
>> What is the effect of a suboptimal ARP cache size? Does that affect
>> the latency of messages too?
> It hurts latency because an arp reply has to come back before you can
> send your packet.
> -- greg
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