Hi Ryan, On Thu, 17 Oct 2024 13:32:43 +0100 Ryan Roberts <ryan.roberts@xxxxxxx> wrote: >[...] > I understand that Suse might be able to help with wider performance testing Sorry for the delay (vacation, other tasks). Anyway, let me share some results with you. First, I have looked only at 4k pages (constant v. selected at boot time) so far. Second, the impact of the patch series is much smaller than I expected. Most macro-benchmarks (dbench, io-bench) did not see any significant slowdown. There appears to be a performance hit of approx. 1-2%, but that's within noise, and I can't dedicate my time to running extensive tests to find the distribution peak and compare. In short, I suspect a slight performance hit, but I cannot quantify it. Third, a few micro-benchmarks saw a significant regression. Most notably, getenv and getenvT2 tests from libMicro were 18% and 20% slower with variable page size. I don't know why, but I'm looking into it. The system() library call was also about 18% slower, but that might be related. The dup() syscall was up to 5% slower (depends on underlying filesystem type). VMA unmap was slower for some sizes, but the pattern seemed random, sometimes giving even better performance with variable page size, so this micro-benchmark may be too unstable to draw any conclusions. Stay tuned Petr T
