Messages in this thread | | | Subject | Re: [PATCH tip/core/rcu 3/4] md/bitmap: Fix list_entry_rcu usage | From | Patrick Marlier <> | Date | Wed, 23 Sep 2015 19:57:53 +0200 |
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On 09/22/2015 10:50 PM, Paul E. McKenney wrote: > On Sun, Sep 13, 2015 at 09:10:24AM -0700, Paul E. McKenney wrote: >> On Sun, Sep 13, 2015 at 12:06:33PM +0200, Patrick Marlier wrote: > > [ . . . ] > >>> Paul, >>> >>> This sounds good to me. It should fix the performance issue (will >>> check with my benchmark). >> >> Thank you, looking forward to seeing the results! > > Just following up -- how is the benchmarking going?
Note that in my module I am using the kernel version 3.16.0-31 (I ported your change). Here the results of my benchmark that tests rculist in the case of read only.
# 1st column : The number of threads # 2nd : ops/s the original version # 3rd : ops/s your version with lockless_dereference 1 883923 1747554 2 1741441 3543062 3 2462360 5103647 4 3437273 7176608 6 5155803 9812348 8 6718111 13330050 10 8519227 17458294 12 9773632 20298897 14 11555198 23191424 16 11643264 25125712
I get same performance with my patch. So indeed it fixes the performance problem I was seeing.
Thanks a lot! -- Pat
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