Date: Fri, 18 Dec 2009 21:15:22 +1100 From: Emil Mikulic <emikulic@gmail.com> To: Alexander Zagrebin <alexz@visp.ru> Cc: freebsd-current@freebsd.org Subject: Re: ZFS and UFS on the same box. Cache memory allocation issue. Message-ID: <20091218101522.GD71197@dmr.ath.cx> In-Reply-To: <398F182D4FC14D43A1CFD89C4D69817C@vosz.local> References: <398F182D4FC14D43A1CFD89C4D69817C@vosz.local>
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On Fri, Dec 18, 2009 at 11:49:47AM +0300, Alexander Zagrebin wrote: > As result UFS returns memory to "free" pool and ZFS can allocate it for ARC. > It significantly increases ZFS performance. > > Is there an another workaround? I use: (cd /somefs && sudo umount /somefs) The umount fails, but it does clear the buffer cache! Memory reported as "inactive" by top decreases. I find this to be a really handy trick when benchmarking I/O. ;) Unfortunately, it doesn't work on the root filesystem. --Emil
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