Messages in this thread | | | Date | Wed, 14 Nov 2001 21:41:22 +0100 | Subject | Re: linux readahead setting? | From | (Erik Tews) |
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On Wed, Nov 14, 2001 at 12:26:20PM -0800, Mike Fedyk wrote: > On Tue, Nov 13, 2001 at 10:01:39PM +0100, Erik Tews wrote: > > Thanks, for all the answers via pm, but I would like to explain a litte > > bit more what I am looking for. I got this filesystem on lvm, and I want > > my harddisk if there a several processes accessing the disk-image to go > > to the position of process one, read 256k of data, go to the position of > > process two, read 256k of data, go again to the position of the nex > > process, read 256k of data and so one to minimize movement of the > > harddisk-readhead. > > At which level do you want the read ahead? > > If you read ahead at the block level, you may not get data for the file you > want because of fragmentation. This is especially true with long running > Reiser file systems.
I think fragmentation will be no problem, because this filesystem contains only one file.
Readahead should be done on filesystem or block-level. Not on disklevel. I can tune that with lvm, but I was not sure if a bigger readahead-value is that what I want. - 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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