Date: Sat, 20 Aug 2016 18:22:25 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Karl Denninger <karl@denninger.net> Cc: Slawa Olhovchenkov <slw@zxy.spb.ru>, freebsd-fs@freebsd.org Subject: Re: ZFS ARC under memory pressure Message-ID: <20160820152225.GP83214@kib.kiev.ua> In-Reply-To: <bcb14d0b-bd6d-cb93-ea71-3656cfce8b3b@denninger.net> References: <20160816193416.GM8192@zxy.spb.ru> <8dbf2a3a-da64-f7f8-5463-bfa23462446e@FreeBSD.org> <20160818202657.GS8192@zxy.spb.ru> <c3bc6c5a-961c-e3a4-2302-f0f7417bc34f@denninger.net> <20160819201840.GA12519@zxy.spb.ru> <bcb14d0b-bd6d-cb93-ea71-3656cfce8b3b@denninger.net>
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On Fri, Aug 19, 2016 at 03:38:55PM -0500, Karl Denninger wrote: > Paging *always* requires one I/O (to write the page(s) to the swap) and > MAY involve two (to later page it back in.) It is never a "win" to > spend a *guaranteed* I/O when you can instead act in a way that *might* > cause you to (later) need to execute one. Why would pagedaemon need to write out clean page ?
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