Date: Wed, 28 Aug 2013 21:31:30 -0400 From: Garrett Wollman <wollman@bimajority.org> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-fs@freebsd.org Subject: Re: NFS on ZFS pure SSD pool Message-ID: <21022.42098.291440.900505@hergotha.csail.mit.edu> In-Reply-To: <461209820.15034260.1377733709648.JavaMail.root@uoguelph.ca> References: <21022.29128.557471.157078@hergotha.csail.mit.edu> <461209820.15034260.1377733709648.JavaMail.root@uoguelph.ca>
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<<On Wed, 28 Aug 2013 19:48:29 -0400 (EDT), Rick Macklem <rmacklem@uoguelph.ca> said: > You should get your users to do their mounts over flaky WiFi links > and such, in order to make better use of the cache;-) We don't support NFS use by such clients -- it's purely for compute cluster type applications. Anything that can use AFS is supposed to use AFS. > By the way Garrett, what do you have kern.ipc.nmbclusters set to, > since cache entries will use mbuf clusters normally. I have it at 2**20, which is actually only important because it causes kern.ipc.nmbjumbop to be set as a side effect. We also set maxusers (to match the new calculation in 10-current) so that other kernel data structures will be sized appropriately. This server's pretty idle right now: 36907/150098/187005 mbufs in use (current/cache/total) 948/22794/23742/1048576 mbuf clusters in use (current/cache/total/max) 0/4352 mbuf+clusters out of packet secondary zone in use (current/cache) 24583/36548/61131/524288 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/262144 9k jumbo clusters in use (current/cache/total/max) 0/0/0/131072 16k jumbo clusters in use (current/cache/total/max) 109454K/229304K/338759K bytes allocated to network (current/cache/total) On a machine without jumbo frames, it looks like this: 10829/230836/241665 mbufs in use (current/cache/total) 8268/93146/101414/1048576 mbuf clusters in use (current/cache/total/max) 8190/80641 mbuf+clusters out of packet secondary zone in use (current/cache) 0/1993/1993/524288 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/262144 9k jumbo clusters in use (current/cache/total/max) 0/0/0/131072 16k jumbo clusters in use (current/cache/total/max) 19243K/251973K/271216K bytes allocated to network (current/cache/total) -GAWollman
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