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Message-ID: <473AD5C5.4030803@wpkg.org> Date: Wed, 14 Nov 2007 12:02:29 +0100 From: Tomasz Chmielewski <mangoo@...g.org> To: LKML <linux-kernel@...r.kernel.org> Subject: Re: Strage buffer behaviour Denys Vlasenko wrote: > On Sunday 11 November 2007 11:33, Tino Keitel wrote: >> The dd command reads 100 MB from each partition two times in a row. It >> looks like sda1 and sda2 are not bufferd (the first 4 dd runs), but >> sda3 and sda4 are (the last 4 dd runs). >> >> The computer is a Mac mini with a 2,5" SATA hard disk. The first 2 >> partitions contain EFI and MacOS X, and are unused in Linux. The last 2 >> partitions are an ext3 partition for / and an LVM for the rest of the >> sytem. >> >> Any hints how the dd/buffering behaviour could be explained? The system >> was mostly idle, and the numbers are reproducible across reboots. > > IIRC only mounted partitions' reads are cached. Or, in general, those devices which kernel actually "uses" (mounted, but also LVM, RAID, which don't have to be mounted to get cached). -- Tomasz Chmielewski http://lists.wpkg.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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