[Aarch64] memcpy IFUNC for Cavium ThunderX2

  This patch adds a new memcpy ifunc for Cavium ThunderX2.  The difference
between this and the Thunderx version is in the prefetching.  ThunderX2
has different cache characteristics and so uses a different prefetching
strategy.  Note that I prefetch past the end of the buffer being copied
but my understanding is that that is legal and should never generate any
errors.  I tried adding code to not prefetch past the end of the source
but those changes slowed down memcpy so I did not include them.

I did not copy memcpy_thunderx.S to memcpy_thunderx2.S but just use
memcpy_thunderx2.S to set some macros and then include memcpy_thunderx.S.
This is to reduce duplicate code.

I have attached the memcpy benchmark output files from a ThunderX2 run,
the main differences are in bench-memcpy-large.out.

Tested with no regressions, OK to checkin?

Steve Ellcey
sellcey@cavium.com


2018-02-14  Steve Ellcey  <sellcey@cavium.com>

	* sysdeps/aarch64/multiarch/Makefile (sysdep_routines):
	Add memcpy_thunderx2.
	* sysdeps/aarch64/multiarch/ifunc-impl-list.c (MAX_IFUNC):
	Increment to 4.
	(__libc_ifunc_impl_list): Add __memcpy_thunderx2.
	* sysdeps/aarch64/multiarch/memcpy.c (libc_ifunc): Add IS_THUNDERX2
	and IS_THUNDERX2PA checks.
	* sysdeps/aarch64/multiarch/memcpy_thunderx.S (USE_THUNDERX2):
	Use macro to set name appropriately.
	(memcpy): Use USE_THUNDERX2 macro to modify prefetches.
	* sysdeps/aarch64/multiarch/memcpy_thunderx2.S: New file.
	* sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_THUNDERX2PA):
	New macro.
	(IS_THUNDERX2): New macro.
{
 "timing_type": "clock_gettime",
 "functions": {
  "memcpy": {
   "bench-variant": "walk",
   "ifuncs": ["__memcpy_thunderx", "__memcpy_thunderx2", "__memcpy_falkor", "__memcpy_generic"],
   "results": [
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  }
 }
}
  

On Thursday 15 February 2018 05:34 AM, Steve Ellcey wrote:
> I have attached the memcpy benchmark output files from a ThunderX2 run,
> the main differences are in bench-memcpy-large.out.

You can get a pretty report of your string benchmark results with the
compare_strings.py script:

../benchtests/scripts/compare_strings.py \
	-i benchtests/bench-memcpy.out \
	-s ../benchtests/scripts /benchout_strings.schema.json \
	-a length \
	-b __memcpy_generic

That should also make it easier to compare with various versions by
setting different baselines (-b).

Siddhesh
  

On Thursday 15 February 2018 03:10 PM, Siddhesh Poyarekar wrote:
> On Thursday 15 February 2018 05:34 AM, Steve Ellcey wrote:
>> I have attached the memcpy benchmark output files from a ThunderX2 run,
>> the main differences are in bench-memcpy-large.out.
> 
> You can get a pretty report of your string benchmark results with the
> compare_strings.py script:
> 
> ../benchtests/scripts/compare_strings.py \
> 	-i benchtests/bench-memcpy.out \
> 	-s ../benchtests/scripts /benchout_strings.schema.json \
> 	-a length \

Actually, bench-memcpy has attributes len,align1,align2.  It is
bench-memcpy-walk that has only length attribute.  I forgot to mention
that the script also creates graphs if you're into that sort of thing :)

Siddhesh
  

On 15/02/18 00:04, Steve Ellcey wrote:
> This patch adds a new memcpy ifunc for Cavium ThunderX2.  The difference
> between this and the Thunderx version is in the prefetching.  ThunderX2
> has different cache characteristics and so uses a different prefetching
> strategy.  Note that I prefetch past the end of the buffer being copied
> but my understanding is that that is legal and should never generate any
> errors.  I tried adding code to not prefetch past the end of the source
> but those changes slowed down memcpy so I did not include them.
> 
> I did not copy memcpy_thunderx.S to memcpy_thunderx2.S but just use
> memcpy_thunderx2.S to set some macros and then include memcpy_thunderx.S.
> This is to reduce duplicate code.
> 
> I have attached the memcpy benchmark output files from a ThunderX2 run,
> the main differences are in bench-memcpy-large.out.
> 
> Tested with no regressions, OK to checkin?
> 

the code looks ok, and it is ok to commit if you think this gives
benefit on thunderx2 (it should not affect other targets other
than code bloat).

i prefer not to add a new memcpy every time there is a new uarch,
so i think in the long term old ones should be removed or merged
(i'm not yet sure what's the right policy here, e.g. if a target
is not available to anyone in the community for benchmarking it
will be removed or if there is not enough performance benefit).

i don't see a huge performance difference in the benchmark logs
and there are a few weird cases e.g. in bench-memcpy.out

     {
      "length": 1888,
      "align1": 0,
      "align2": 59,
      "timings": [151.016, 1905.47, 150.547, 257.656, 147.969, 151.172]
     },

the memcpy_thunderx2 is very slow (and memcpy_falkor is the fastest).

> Steve Ellcey
> sellcey@cavium.com
> 
> 
> 2018-02-14  Steve Ellcey  <sellcey@cavium.com>
> 
> 	* sysdeps/aarch64/multiarch/Makefile (sysdep_routines):
> 	Add memcpy_thunderx2.
> 	* sysdeps/aarch64/multiarch/ifunc-impl-list.c (MAX_IFUNC):
> 	Increment to 4.
> 	(__libc_ifunc_impl_list): Add __memcpy_thunderx2.
> 	* sysdeps/aarch64/multiarch/memcpy.c (libc_ifunc): Add IS_THUNDERX2
> 	and IS_THUNDERX2PA checks.
> 	* sysdeps/aarch64/multiarch/memcpy_thunderx.S (USE_THUNDERX2):
> 	Use macro to set name appropriately.
> 	(memcpy): Use USE_THUNDERX2 macro to modify prefetches.
> 	* sysdeps/aarch64/multiarch/memcpy_thunderx2.S: New file.
> 	* sysdeps/unix/sysv/linux/aarch64/cpu-features.h (IS_THUNDERX2PA):
> 	New macro.
> 	(IS_THUNDERX2): New macro.
>
  

On Fri, 2018-02-16 at 18:39 +0000, Szabolcs Nagy wrote:
> 
> the code looks ok, and it is ok to commit if you think this gives
> benefit on thunderx2 (it should not affect other targets other
> than code bloat).
> 
> i prefer not to add a new memcpy every time there is a new uarch,
> so i think in the long term old ones should be removed or merged
> (i'm not yet sure what's the right policy here, e.g. if a target
> is not available to anyone in the community for benchmarking it
> will be removed or if there is not enough performance benefit).
> i don't see a huge performance difference in the benchmark logs
> and there are a few weird cases e.g. in bench-memcpy.out
> 
>      {
>       "length": 1888,
>       "align1": 0,
>       "align2": 59,
>       "timings": [151.016, 1905.47, 150.547, 257.656, 147.969, 151.172]
>      },
> 
> the memcpy_thunderx2 is very slow (and memcpy_falkor is the fastest).

The benefit isn't huge but I think it is large enough to be helpful on
some programs.  I reran the benchmarks again and looked at the results.
This particular anomoly seems to have gone away (though falkor is still
faster for this specific instance).  I am not sure why it showed up
before, I was on a machine with no other users but there still may have
been something running that caused this hiccup.

    {
     "length": 1888,
     "align1": 0,
     "align2": 59,
     "timings": [154.062, 1905.78, 151.641, 150.625, 146.094, 150.312]
    },

The code run for ThunderX and ThunderX2 in this instance would be the
same because the length isn't large enough to trigger the prefetch
loop anyway.

I will check this in later unless someone else raises some objections.

Steve Ellcey
sellcey@cavium.com