Date: Sun, 12 Feb 2012 18:34:22 +0100 From: Alex Samorukov <ml@os2.kiev.ua> To: Adrian Chadd <adrian@freebsd.org> Cc: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>, freebsd-stable@freebsd.org Subject: Re: disk devices speed is ugly Message-ID: <4F37F81E.7070100@os2.kiev.ua> In-Reply-To: <CAJ-VmomezUWrEgxxmUEOhWnmLDohMAWRpSXmTR=n2y_LuizKJg@mail.gmail.com> References: <4F215A99.8020003@os2.kiev.ua> <4F27C04F.7020400@omnilan.de> <4F27C7C7.3060807@os2.kiev.ua> <CAJ-VmomezUWrEgxxmUEOhWnmLDohMAWRpSXmTR=n2y_LuizKJg@mail.gmail.com>
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On 02/12/2012 01:54 AM, Adrian Chadd wrote: > Hi, > > What about the disk access is unaligned? Do you mean not sector aligned? or? Hi. Sector aligned. > This is a common problem people face doing disk IO analysis. > > The whole point about not allowing unaligned access is to make the > disk IO path cleaner. It does mean that the filesystem code (and GEOM > modules involved) need to be smarter. > > If the filesystem is doing ridiculously unaligned access then it > likely should be fixed. Yes. But it will nit fix non-cached access to the disk (raw) devices. And this is the main reason why ntfs-3g and exfat are much slower then working on Linux.
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