Date: Mon, 11 Apr 2016 18:04:42 +0200 From: Edward Tomasz Napierala <trasz@FreeBSD.org> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r297633 - in head: sys/cddl/contrib/opensolaris/uts/common/fs/zfs sys/fs/ext2fs sys/kern sys/sys sys/ufs/ffs sys/ufs/ufs sys/vm usr.bin/rctl Message-ID: <20160411160442.GA9392@brick.home> In-Reply-To: <20160407133250.GA5298@zxy.spb.ru> References: <201604070423.u374NP0Z021115@repo.freebsd.org> <20160407133250.GA5298@zxy.spb.ru>
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On 0407T1632, Slawa Olhovchenkov wrote: > On Thu, Apr 07, 2016 at 04:23:25AM +0000, Edward Tomasz Napierala wrote: > > > Author: trasz > > Date: Thu Apr 7 04:23:25 2016 > > New Revision: 297633 > > URL: https://svnweb.freebsd.org/changeset/base/297633 > > > > Log: > > Add four new RCTL resources - readbps, readiops, writebps and writeiops, > > for limiting disk (actually filesystem) IO. > > > > Note that in some cases these limits are not quite precise. It's ok, > > as long as it's within some reasonable bounds. > > > > Testing - and review of the code, in particular the VFS and VM parts - is > > very welcome. > > How you calculate iops for sequential IOs? As distinc IOPS or merged? > > I.e. readin 1 sector from offset 100 and immediately reading 1 sectro > from offset 101 accounting as 2IOPS or as 1IOPS? Probably one, due to taking readahead into account. But it depends on the filesystem, and is only an best-effort estimation.
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