Messages in this thread | | | Date | Mon, 8 Sep 2003 16:33:34 +0200 | From | Jens Axboe <> | Subject | Re: [blockdevices/NBD] huge read/write-operations are splitted by the kernel |
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On Mon, Sep 08 2003, Sven Köhler wrote: > >You'll probably find that if you bump the max_sectors count if your > >drive to 256 from 255 (that is the default if you haven't set it), then > >you'll see 128kb chunks all the time. > > Why is 255 the default. It seems to be an inefficient value. Perhaps the > NBD itself should set it to 256.
To avoid 8-bit wrap arounds, basically. Not sure it's still very valid, you are free to compile your kernel with it set to 256. 2.6 uses 256 by default.
> >See max_sectors[] array. > > Well, i found the declaration, but i can't imagine how to set the values > in it.
You can grep for other examples in the kernel, I would imagine?
-- Jens Axboe
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