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Diffstat (limited to 'gitlab/issues/target_arm/host_arm/accel_missing/1857.toml')
| -rw-r--r-- | gitlab/issues/target_arm/host_arm/accel_missing/1857.toml | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/gitlab/issues/target_arm/host_arm/accel_missing/1857.toml b/gitlab/issues/target_arm/host_arm/accel_missing/1857.toml deleted file mode 100644 index 57effb592..000000000 --- a/gitlab/issues/target_arm/host_arm/accel_missing/1857.toml +++ /dev/null @@ -1,60 +0,0 @@ -id = 1857 -title = "Major qemu-aarch64 performance slowdown since commit 59b6b42cd3" -state = "closed" -created_at = "2023-09-01T14:00:23.709Z" -closed_at = "2023-09-01T15:15:06.829Z" -labels = ["host: arm", "host: loongarch64", "target: arm"] -url = "https://gitlab.com/qemu-project/qemu/-/issues/1857" -host-os = "Gentoo Linux & Ubuntu & Debian" -host-arch = "loongarch64 & aarch64 & x86_64" -qemu-version = "8.0.0, 8.1.0 and master" -guest-os = "Linux user" -guest-arch = "AArch64" -description = """I have observed a major performance slowdown between qemu 8.0.0 and 8.1.0: - - -qemu 8.0.0: 0.8s - -qemu 8.1.0: 6.8s - - -After bisecting the commits between 8.0.0 and 8.1.0, the offending commit is 59b6b42cd3: - - -commit 59b6b42cd3446862567637f3a7ab31d69c9bef51 -Author: Richard Henderson <richard.henderson@linaro.org> -Date: Tue Jun 6 10:19:39 2023 +0100 - - target/arm: Enable FEAT_LSE2 for -cpu max - - Reviewed-by: Peter Maydell <peter.maydell@linaro.org> - Signed-off-by: Richard Henderson <richard.henderson@linaro.org> - Message-id: 20230530191438.411344-21-richard.henderson@linaro.org - Signed-off-by: Peter Maydell <peter.maydell@linaro.org> - - -Reverting the commit in latest master fixes the problem: - -qemu 8.0.0: 0.8s - -qemu 8.1.0: 6.8s - -qemu master + revert 59b6b42cd3: 0.8s - -Alternatively, specify `-cpu cortex-a35` to disable LSE2: - -`time ./qemu-aarch64 -cpu cortex-a35`: 0.8s - -`time ./qemu-aarch64`: 6.77s - -The slowdown is also observed when running qemu-aarch64 on aarch64 machine: - -`time ./qemu-aarch64 /usr/bin/node -e 1`: 2.91s - -`time ./qemu-aarch64 -cpu cortex-a35 /usr/bin/node -e 1`: 1.77s - -The slowdown on x86_64 machine is small: 362ms -> 378ms.""" -reproduce = """1. Run `time ./qemu-aarch64 node-aarch64 -e 1` (node-aarch64 is NodeJS v16 built for AArch64) -2. Using qemu master, the output says `0.8s` -3. Using qemu master with commit 59b6b42cd3 reverted, the output says `6.77s`""" -additional = """""" |