Date: Sat, 11 Feb 2012 16:54:37 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Alex Samorukov <ml@os2.kiev.ua> Cc: Harald Schmalzbauer <h.schmalzbauer@omnilan.de>, freebsd-stable@freebsd.org Subject: Re: disk devices speed is ugly Message-ID: <CAJ-VmomezUWrEgxxmUEOhWnmLDohMAWRpSXmTR=n2y_LuizKJg@mail.gmail.com> In-Reply-To: <4F27C7C7.3060807@os2.kiev.ua> References: <4F215A99.8020003@os2.kiev.ua> <4F27C04F.7020400@omnilan.de> <4F27C7C7.3060807@os2.kiev.ua>
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Hi, What about the disk access is unaligned? Do you mean not sector aligned? or? 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. Adrian
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