On 19 Jun 2018, at 23:51, Huang, Ying wrote:
"Huang, Ying" <ying.hu...@intel.com> writes:
Hi, Josef,
Do you have time to take a look at the regression?
kernel test robot <xiaolong...@intel.com> writes:
Greeting,
FYI, we noticed a -12.3% regression of blogbench.write_score and a
+9.6% improvement
of blogbench.read_score due to commit:
commit: 9092c71bb724dba2ecba849eae69e5c9d39bd3d2 ("mm: use
sc->priority for slab shrink targets")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git
master
in testcase: blogbench
on test machine: 16 threads Intel(R) Xeon(R) CPU D-1541 @ 2.10GHz
with 8G memory
with following parameters:
disk: 1SSD
fs: btrfs
cpufreq_governor: performance
test-description: Blogbench is a portable filesystem benchmark
that tries to reproduce the load of a real-world busy file server.
test-url:
I'm surprised, this patch is a big win in production here at FB. I'll
have to reproduce these results to better understand what is going on.
My first guess is that since we have fewer inodes in slab, we're reading
more inodes from disk in order to do the writes.
But that should also make our read scores lower.
-chris
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