Date: Thu, 18 Mar 2010 15:46:31 -0300 From: Thiago Damas <tdamas@gmail.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: freebsd-hackers@freebsd.org Subject: Re: ATA 4K sector issues Message-ID: <f8e3d83f1003181146o3366e9en9422f11e305475c8@mail.gmail.com> In-Reply-To: <f8e3d83f1003171417s60196803ra4884dae487edb9a@mail.gmail.com> References: <alpine.BSF.2.00.1003171114280.74067@mignon.ki.iif.hu> <86tysf58a2.fsf@ds4.des.no> <alpine.BSF.2.00.1003171652260.74067@mignon.ki.iif.hu> <f8e3d83f1003171034m5e75eae4r5e8b31d88d361d3b@mail.gmail.com> <367b2c981003171112n785ea9d4q21d00b533819ca67@mail.gmail.com> <f8e3d83f1003171117k20d553b7y7ce4c3c8ed2f5c96@mail.gmail.com> <201003172023.o2HKNNbj069321@apollo.backplane.com> <201003172111.o2HLBIgJ069873@apollo.backplane.com> <f8e3d83f1003171417s60196803ra4884dae487edb9a@mail.gmail.com>
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I tested now with 1Mb (2048 blocks) at the begining of disk, and same behaviour: slow write speed and high disk latency. On Wed, Mar 17, 2010 at 6:17 PM, Thiago Damas <tdamas@gmail.com> wrote: > I'll try tomorrow more zfs tests, with 1M alignment on begining of disk. > But I also remember that zfs block size its 128k, but metadata can be of > dynamic size. And we can use compressed files too. > There is a sysctl, md_compress, that I turned out in my tests, but not > working as expected. > Why using gnop -S 4096 works well? > > Thiago > >
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