arm64 fio 4k dio测试性能低

#!/bin/bash

numjobs=10
iodepth=10
mkdir /test
for rw in read write randread randwrite randrw ; do
	for bs in 4 16 32 64 128 256 512 1024; do
		mkfs.ext4 -F /dev/nvme0n1
		mount /dev/nvme0n1 /test
		if [ $rw == "randrw" ];then
			./fio -filename=/test/fio -direct=1 -iodepth ${iodepth} -thread -rw=$rw -rwmixread=70 -ioengine=libaio -bs=${bs}k \
			       	-size=100G -numjobs=${numjobs} -runtime=30 -group_reporting -name=job1
		else
			./fio -filename=/test/fio -direct=1 -iodepth ${iodepth} -thread -rw=$rw -ioengine=libaio -bs=${bs}k \
				-size=100G -numjobs=${numjobs} -runtime=30 -group_reportin -name=job1
		fi
		umount /test
		sleep 30
	done
done

使用如上脚本进行测试，4k dio read 性能较低。

输入图片说明

通过如上火焰图可知，大量时间耗费在 down_write 流程中。
找到导致该现象的补丁为：
bb24e7e6309a Revert "ext4: Allow parallel DIO reads"
5b2a409373fc Revert "ext4: remove EXT4_STATE_DIOREAD_LOCK flag"

通过如下补丁可以修复arm64上的问题：
bcce988f1b44 config: Enable CONFIG_EXT4_PARALLEL_DIO_READ as default
4a5b1b53d6d1 ext4: update direct I/O read lock pattern for IOCB_NOWAIT
5d00e2bce2c1 Revert "Revert "ext4: remove EXT4_STATE_DIOREAD_LOCK flag""
9f40d9fa3b78 Revert "Revert "ext4: Allow parallel DIO reads""

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arm64 fio 4k dio测试性能低

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