Date: Fri, 19 Sep 2003 12:06:31 -0800 (GMT-08:00) From: tlambert2@mindspring.com To: John-Mark Gurney <gurney_j@efn.org>, Richard Sharpe <rsharpe@richardsharpe.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Throughput problems with NFS between Linux and FreeBSD Message-ID: <27372991.1064001992219.JavaMail.root@wamui06.slb.atl.earthlink.net>
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John-Mark Gurney wrote: > Richard Sharpe wrote this message on Fri, Sep 19, 2003 at 10:38 -0700: > > The problem seems to be the following code > > > > if (so->so_type == SOCK_STREAM) > > siz = NFS_MAXPACKET + sizeof (u_long); > > else > > siz = NFS_MAXPACKET; > > error = soreserve(so, siz, siz); > > > > in src/sys/nfs/nfs_syscalls.c. > > > > We added a sysctl to allow finer control over what is passed to soreserve. > > > > With the fix in, it goes up to around wire speed when lots of data is in > > the cache. > > What is the fix? You don't say what adjustments to soreserve's parameters > are necessary to improve performance? Have you done testing against other > clients to see how your changes will affect performance on those machines? FWIW: I think he means that they change the value of NFS_MAXPACKET. This would actually make sense: you really want the value to be NFS_MAXPACKET times the number of packets you want to allow, up to the TCP window size... ...unless I'm seriously misunderstanding him. -- Terry
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