Date: Thu, 6 Feb 2014 20:58:35 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: Garrett Wollman <wollman@freebsd.org> Cc: freebsd-net@freebsd.org, Alexander Motin <mav@freebsd.org> Subject: Re: Terrible NFS performance under 9.2-RELEASE? Message-ID: <1261040377.1982994.1391738315028.JavaMail.root@uoguelph.ca> In-Reply-To: <CABXB=RRFfparjXm7_f6aaWHHbpUBoDWOLsjTyWdZmyKx3d2zAw@mail.gmail.com>
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Garrett Wollman wrote:
> The real big improvement, which I have not tried to implement, would
> be to use physical pages (via sfbufs) by sharing the inner loop of
> sendfile(2). Since I use ZFS as my backing filesystem, I'm not sure
> this would have any benefit for me, but it should be a measurable
> improvement for UFS-backed NFS servers.
(I didn't have this email handy, so I just cut/pasted this paragraph.)
Well, I'm far from sure this is a good idea at this point, but I've
attached a patch that seems to work for a short test of an export of
a UFS volume. (If there is no v_object for ZFS vnodes, it will print
out a message with the error# for EINVAL.) It would need some serious
review and testing before it would be anywhere near ready for head.
(For example, since I hold a LK_SHARED locked vnode which was not
VI_DOOMED when it was locked, I don't know if I need to acquire a
reference count on the vm object or if I need to check for OBJ_DEAD?)
The patch checks for OBJ_DEAD, but does not acquire a reference count.
(The reference count part is #ifdef notnow.)
Like most of these things, I don't see a measurable difference on my
old single core i386 hardware with 100Mbps networking, but that only
indicates it might not be a serious regression.
The patch doesn't have yours applied to it, but it should be easy
to integrate the two, since it just adds a call to nfsrv_file_mbuf()
at the beginning of nfsvno_read().
Good luck with the testing, rick
ps: It would be nice to know if it works for ZFS?
pss: If the patch doesn't make it through on the list and you want a
copy, just email me.
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