Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [PATCH 0/4] Fix a crash when block device is read and block size is changed at the same time | Date | Tue, 18 Sep 2012 13:22:40 -0400 |
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Mikulas Patocka <mpatocka@redhat.com> writes:
> Hi Jeff > > Thanks for testing. > > It would be interesting ... what happens if you take the patch 3, leave > "struct percpu_rw_semaphore bd_block_size_semaphore" in "struct > block_device", but remove any use of the semaphore from fs/block_dev.c? - > will the performance be like unpatched kernel or like patch 3? It could be > that the change in the alignment affects performance on your CPU too, just > differently than on my CPU.
I'll give it a try and report back.
> What is the CPU model that you used for testing?
http://ark.intel.com/products/53570/Intel-Xeon-Processor-E7-2860-%2824M-Cache-2_26-GHz-6_40-GTs-Intel-QPI%29
Cheers, Jeff
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