What's the current NFS v3 wsize and rsize? It appears to be 4K - and
just wanted a confirmation.
Thanks,
Wim
On Mon, Oct 01, 2007 at 11:05:40PM -0400, Trond Myklebust wrote:
> On Tue, 2007-10-02 at 04:51 +0200, Gabriel Barazer wrote:
> > On 10/02/2007 1:11:01 AM +0200, Trond Myklebust
> > <[email protected]> wrote:
> > > On Mon, 2007-10-01 at 15:04 -0700, Wim Colgate wrote:
> > >> What???s the current NFS v3 wsize and rsize? It appears to be 4K ??? and
> > >> just wanted a confirmation.
> > >>
> > >
> > > It sounds like you are working with an old system. IIRC, older versions
> > > of RedHat used to jimmy the 'mount' command to make 4k the default,
> > > because that worked best with UDP mounts on crummy networks.
> > >
> > > For newer clients, the default should depend on what your server
> > > specifies in the FSINFO nfs command. For most servers, when you mount
> > > with a TCP connection, the default will be 32k, but some may have larger
> > > defaults (NetApp servers often specify a 64k default) or smaller (older
> > > Linux servers will support an 8k maximum).
> >
> > I see on my servers (>2.6.21, latest nfs-utils) that the rsize/wsize is
> > actually defined by the amount of memory on the NFS server. It seems to
> > set the rsize/wsize to (total memory)/8192 (512k in my case for a 4GB
> > nfs server). Is it a bug or a wanted behavior ?
>
> On a standard 2.6.23-rc8, the server sets RPCSVC_MAXPAYLOAD_TCP == 1MB,
> RPCSVC_MAXPAYLOAD_UDP == 32k. There is no link to the total amount of
> memory.
I think Gabriel may be referring to this code in fs/nfsd/nfssvc.c
202 if (nfsd_max_blksize == 0) {
203 /* choose a suitable default */
204 struct sysinfo i;
205 si_meminfo(&i);
206 /* Aim for 1/4096 of memory per thread
207 * This gives 1MB on 4Gig machines
208 * But only uses 32K on 128M machines.
209 * Bottom out at 8K on 32M and smaller.
210 * Of course, this is only a default.
211 */
212 nfsd_max_blksize = NFSSVC_MAXBLKSIZE;
213 i.totalram <<= PAGE_SHIFT - 12;
214 while (nfsd_max_blksize > i.totalram &&
215 nfsd_max_blksize >= 8*1024*2)
216 nfsd_max_blksize /= 2;
217 }
You can override this default by writing to
/proc/fs/nfsd/max_block_size (before the first nfsd is started,
which basically means modifying /etc/init.d/nfsserver).
Greg.
--
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
Apparently, I'm Bedevere. Which MPHG character are you?
I don't speak for SGI.
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Thanks Trond,
As usual, you are fast to answer; and right. I was looking through the
code and saw 4K being bantered around. However, cat'ing /proc/mounts
shows 32K for rsize and wsize.
Wim
-----Original Message-----
From: Trond Myklebust [mailto:[email protected]]
Sent: Monday, October 01, 2007 4:11 PM
To: Wim Colgate
Cc: [email protected]
Subject: Re: [NFS] simple question about r/wsize
On Mon, 2007-10-01 at 15:04 -0700, Wim Colgate wrote:
> What's the current NFS v3 wsize and rsize? It appears to be 4K - and
> just wanted a confirmation.
>
It sounds like you are working with an old system. IIRC, older versions
of RedHat used to jimmy the 'mount' command to make 4k the default,
because that worked best with UDP mounts on crummy networks.
For newer clients, the default should depend on what your server
specifies in the FSINFO nfs command. For most servers, when you mount
with a TCP connection, the default will be 32k, but some may have larger
defaults (NetApp servers often specify a 64k default) or smaller (older
Linux servers will support an 8k maximum).
'cat /proc/mounts' should always tell you what the client is actually
using for rsize/wsize.
Cheers
Trond
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