Messages in this thread | ![/](/images/icornerl.gif) | | From | David Howells <> | Subject | Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression | Date | Thu, 16 Nov 2023 16:44:06 +0000 |
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Borislav Petkov <bp@alien8.de> wrote:
> diff --git a/Makefile b/Makefile > index ede0bd241056..94d93070d54a 100644 > --- a/Makefile > +++ b/Makefile > @@ -996,6 +996,8 @@ endif > # change __FILE__ to the relative path from the srctree > KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) > > +KBUILD_CFLAGS += $(call cc-option,-mstringop-strategy=libcall) > + > # include additional Makefiles when needed > include-y := scripts/Makefile.extrawarn > include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
If you wanted this patch trying, I get the following numbers:
iov_kunit_benchmark_bvec: avg 9950 uS, stddev 40 uS iov_kunit_benchmark_bvec: avg 9950 uS, stddev 53 uS iov_kunit_benchmark_bvec: avg 9973 uS, stddev 69 uS iov_kunit_benchmark_bvec_split: avg 9793 uS, stddev 28 uS iov_kunit_benchmark_bvec_split: avg 9800 uS, stddev 41 uS iov_kunit_benchmark_bvec_split: avg 9804 uS, stddev 16 uS iov_kunit_benchmark_kvec: avg 10122 uS, stddev 4403 uS iov_kunit_benchmark_kvec: avg 9757 uS, stddev 1516 uS iov_kunit_benchmark_kvec: avg 9909 uS, stddev 2694 uS iov_kunit_benchmark_xarray: avg 10526 uS, stddev 52 uS iov_kunit_benchmark_xarray: avg 10529 uS, stddev 48 uS iov_kunit_benchmark_xarray: avg 10532 uS, stddev 63 uS iov_kunit_benchmark_xarray_to_bvec: avg 10468 uS, stddev 23 uS iov_kunit_benchmark_xarray_to_bvec: avg 10469 uS, stddev 157 uS iov_kunit_benchmark_xarray_to_bvec: avg 10471 uS, stddev 163 uS
I'm using the 6 patches here:
https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=iov-kunit
Set CONFIG_TEST_IOV_ITER=m and then load the kunit_iov_iter.ko module. It'll dump its benchmarks to dmesg.
David
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