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e6438341d1
Upstream lz4 mentioned a performance regression on Qualcomm SoCs when built with Clang, but not with GCC [1]. However, according to my testing on sm8350 with LLVM Clang 15, this patch does offer a nice 10% boost in decompression, so enable the fast dec loop for Clang as well. Testing procedure: - pre-fill zram with 1GB of real-word zram data dumped under memory pressure, for example $ dd if=/sdcard/zram.test of=/dev/block/zram0 bs=1m count=1000 - $ fio --readonly --name=randread --direct=1 --rw=randread \ --ioengine=psync --randrepeat=0 --numjobs=4 --iodepth=1 \ --group_reporting=1 --filename=/dev/block/zram0 --bs=4K --size=1000M Results: - vanilla lz4: read: IOPS=1646k, BW=6431MiB/s (6743MB/s)(4000MiB/622msec) - lz4 fast dec: read: IOPS=1775k, BW=6932MiB/s (7269MB/s)(4000MiB/577msec) [1] https://github.com/lz4/lz4/pull/707 Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com> Signed-off-by: azrim <mirzaspc@gmail.com>