Date: Mon, 04 Mar 2013 06:46:37 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Don Lewis <truckman@FreeBSD.org> Cc: deeptech71@gmail.com, freebsd-current@FreeBSD.org, peter@rulingia.com, ian@FreeBSD.org Subject: Re: access to hard drives is "blocked" by writes to a flash drive Message-ID: <63373.1362379597@critter.freebsd.dk> In-Reply-To: <201303040301.r2431Rjm008175@gw.catspoiler.org> References: <201303040301.r2431Rjm008175@gw.catspoiler.org>
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Content-Type: text/plain; charset=ISO-8859-1 -------- In message <201303040301.r2431Rjm008175@gw.catspoiler.org>, Don Lewis writes: >When using TCQ or NCQ, perhaps we should limit the number of outstanding >writes per device to leave some slots open for reads. We should >probably also prioritize reads over writes unless we are under memory >pressure. Camera-grade flash seldom support either, they are strictly serial. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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