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SubjectRe: [PATCH 0/9] x86: Concurrent TLB flushes and other improvements
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On 6/12/19 11:48 PM, Nadav Amit wrote:
> Running sysbench on dax w/emulated-pmem, write-cache disabled, and
> various mitigations (PTI, Spectre, MDS) disabled on Haswell:
>
> sysbench fileio --file-total-size=3G --file-test-mode=rndwr \
> --file-io-mode=mmap --threads=4 --file-fsync-mode=fdatasync run
>
> events (avg/stddev)
> -------------------
> 5.2-rc3: 1247669.0000/16075.39
> +patchset: 1290607.0000/13617.56 (+3.4%)

Why did you decide on disabling the side-channel mitigations? While
they make things slower, they're also going to be with us for a while,
so they really are part of real-world testing IMNHO. I'd be curious
whether this set has more or less of an advantage when all the
mitigations are on.

Also, why only 4 threads? Does this set help most when using a moderate
number of threads since the local and remote cost are (relatively) close
vs. a large system where doing lots of remote flushes is *way* more
time-consuming than a local flush?

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