Date: Tue, 22 Apr 2008 23:08:51 +0200 From: Jeremie Le Hen <jeremie@le-hen.org> To: freebsd-current@FreeBSD.org Cc: Daichi GOTO <daichi@freebsd.org>, Masanori OZAWA <ozawa@ongs.co.jp> Subject: Re: unionfs makes -CURRENT very sluggish Message-ID: <20080422210851.GE92168@obiwan.tataz.chchile.org> In-Reply-To: <20080422203435.GA92168@obiwan.tataz.chchile.org> References: <20080422203435.GA92168@obiwan.tataz.chchile.org>
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Hi, On Tue, Apr 22, 2008 at 10:34:35PM +0200, Jeremie Le Hen wrote: > I tried to compile lib/ncurses through unionfs. It is utterly slow, no > matter I mount with noatime or not. > > Relevant mounts: > % /usr/src on /space/chroot/usr/src (nullfs, local, read-only) > % <above>:/space/chroot/usr/src.union on /space/chroot/usr/src (unionfs, local) > > % root:~# chroot /space/chroot > % root:/# cd /usr/src/ > % root:/# make buildenv > % # cd lib/ncurses > % # time make > > Compile time without noatime: > 5089.47 real 1670.72 user 3364.89 sys > > Compile time with noatime: > 5083.22 real 1664.10 user 3369.22 sys > > Now if I remove the unionfs mount and just use nullfs: > 255.47 real 150.51 user 83.82 sys > > > As you can see, most of the time is spent in kernel. I'm recompiling my > kernel with hwpmc right now in order to profile it. Any other debug > hint would be welcome. > > FWIW, "while sleep 1 ; do date ; done" runs jerkily when unionfs is run: > Tue Apr 22 21:20:06 CEST 2008 > Tue Apr 22 21:20:13 CEST 2008 > Tue Apr 22 21:20:17 CEST 2008 > Tue Apr 22 21:20:22 CEST 2008 > Tue Apr 22 21:20:29 CEST 2008 > > Whereas it runs smoothly without unionfs. > > I'll give the result of hwpmc ASAP. I've upgraded to the latest -CURRENT and the problem went away. Sorry for the noise. Regards, -- Jeremie Le Hen < jeremie at le-hen dot org >< ttz at chchile dot org >
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