Messages in this thread | | | Date | Thu, 5 Mar 1998 01:29:56 -0500 (EST) | From | Emil Briggs <> | Subject | Re: Patch for block write clustering |
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>> 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
Thanks. I'll put some printk's in 2.0.33 and 2.1.xx and see if I can figure out what's going on. From your other note about the request queues I think I'll try some tests that access multiple partitions at the same time and see how that works.
Thanks Emil
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