Date: Sat, 31 Oct 2020 02:31:38 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Cy Schubert <Cy.Schubert@cschubert.com> Cc: qroxana <qroxana@mail.ru>, freebsd-current@freebsd.org Subject: Re: OpenZFS: kldload zfs.ko freezes on i386 4GB memory Message-ID: <20201030233138.GD34923@zxy.spb.ru> In-Reply-To: <202010302300.09UN0t4A032372@slippy.cwsent.com> References: <E1kWvLj-0000GY-Ic.qroxana-mail-ru@smtp29.i.mail.ru> <202010300313.09U3D0KZ006216@slippy.cwsent.com> <20201030204622.GF2033@zxy.spb.ru> <202010302053.09UKrAXc031272@slippy.cwsent.com> <20201030220809.GG2033@zxy.spb.ru> <202010302234.09UMYA5d032018@slippy.cwsent.com> <20201030224734.GH2033@zxy.spb.ru> <202010302300.09UN0t4A032372@slippy.cwsent.com>
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On Fri, Oct 30, 2020 at 04:00:55PM -0700, Cy Schubert wrote: > > > > More stresses memory usually refers to performance penalty. > > > > Usually way for better performance is reduce memory access. > > > > > > The reason filesystems (UFS, ZFS, EXT4, etc.) cache is to avoid disk > > > accesses. Nanoseconds vs milliseconds. > > > > I mean compared ZoL ZFS ARC vs old (BSD/Opensolaris/Illumos) ZFS ARC. > > Any reaason to rise ARC hit rate in ZoL case? > > That's what hit rate is. It's a memory access instead of a disk access. > That's what you want. Is ZoL ARC hit rate rise from FreeBSD ARC hit rate?
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