Date: Fri, 26 Sep 2008 09:49:20 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Jeff Wheelhouse <freebsd-hackers@wheelhouse.org>, Dag-Erling =?utf-8?q?Sm=C3=B8rgrav?= <des@des.no> Subject: Re: Major SMP problems with lstat/namei Message-ID: <200809260949.21592.jhb@freebsd.org> In-Reply-To: <868wtf8drl.fsf@ds4.des.no> References: <8185F68B-C443-4891-BEC2-5E3D453DDC93@wheelhouse.org> <05B718C6-BBC9-4B78-B580-4E250199DDCF@wheelhouse.org> <868wtf8drl.fsf@ds4.des.no>
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On Friday 26 September 2008 05:20:14 am Dag-Erling Sm=C3=B8rgrav wrote: > Jeff Wheelhouse <freebsd-hackers@wheelhouse.org> writes: > > http://software.wheelhouse.org/rptest.tar.bz2 >=20 > Thanks. I get similar results on head; vfs.lookup_shared actually seems > to *reduce* performance by about 10% - 20%. I ran the test on both UFS > and ZFS; there is no significant difference. You might try http://www.FreeBSD.org/~jhb/patches/namei_rwlock.patch However, it might also be useful in general to enable lock profiling and se= e=20 which locks (if any) are contested. =2D-=20 John Baldwin
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