Messages in this thread | | | Date | Wed, 4 Mar 1998 18:38:12 +0300 (IST) | From | Gadi Oxman <> | Subject | Re: Patch for block write clustering |
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On Wed, 4 Mar 1998, Emil Briggs wrote:
> Yes, I started looking through the lower-level code. I am puzzled though > as to why the low-level sorting doesn't seem to have much effect in 2.0.33 > at least. Using a stock 2.0.33 kernel with write-caching turned off on the > drive itself causes a huge performance hit. (I can post the benchmark program > I used if anyone wants to try it themselves)
One new 2.1.x function in the sort code is attempt_merge() in drivers/block/ll_rw_blk.c. I doubt that it accounts for the difference, but perhaps -- we can try adding a printk() to that function, and verifying whether it is called frequently under the benchmark.
Gadi
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