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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.puhov@linaro.org, "Emilio G. Cota" , richard.henderson@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Robert Foley writes: > From: "Emilio G. Cota" > > This yields sizable scalability improvements, as the below results show. > > Host: Two Intel E5-2683 v3 14-core CPUs at 2.00 GHz (Haswell) > > Workload: Ubuntu 18.04 ppc64 compiling the linux kernel with > "make -j N", where N is the number of cores in the guest. > > Speedup vs a single thread (higher is better): > > 14 +------------------------------------------------------------= ---+ > | + + + + + + $$$$$$ + = | > | $$$$$ = | > | $$$$$$ = | > 12 |-+ $A$$ = +-| > | $$ = | > | $$$ = | > 10 |-+ $$ ##D#####################D = +-| > | $$$ #####**B**************** = | > | $$####***** ***** = | > | A$#***** B = | > 8 |-+ $$B** = +-| > | $$** = | > | $** = | > 6 |-+ $$* = +-| > | A** = | > | $B = | > | $ = | > 4 |-+ $* = +-| > | $ = | > | $ = | > 2 |-+ $ = +-| > | $ +cputlb-no-bql $$A= $$ | > | A +per-cpu-lock ##D= ## | > | + + + + + + baseline **B= ** | > 0 +------------------------------------------------------------= ---+ > 1 4 8 12 16 20 24 28 > Guest vCPUs > png: https://imgur.com/zZRvS7q Can we re-run these numbers on the re-based series? --=20 Alex Benn=C3=A9e