Messages in this thread |  | | | Date | Thu, 06 Dec 2001 11:09:27 +0100 | | From | Martin Dalecki <> | | Subject | Re: /proc/sys/vm/(max|min)-readahead effect???? |
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Roy Sigurd Karlsbakk wrote: > > > I suspect the per-device readahead for IDE is limiting the > > effect of vm_max_readahead ... > > hm... > > any way to avoid this? I mean... The readahead in vm is layered above the > actual device, and should therefore not be limited... Am I right? You > could do several device calls, and fake readahead, and probably get pretty > much out of it.
He means the hardware device read ahead, which can be changed by using hdparm -a 32 -A1 /dev/hda for example. The value of the read ahead one layer on top of it (read_ahead array) can't have *any* impact on performance. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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