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[参考译文] AM62P:使用 SDK 11_00_09_04 从 eMMC 读取更低的吞吐量

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https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1536495/am62p-lower-throughput-reading-from-emmc-with-sdk-11_00_09_04

部件号:AM62P


工具/软件:

尊敬的 TI 团队

从 SDK  10_01_10_04 切换到 SDK 11_00_09_04 时、我注意到 eMMC 的读数不断恶化。

 日志下方添加一个新的代码   

oot@am62px-var-som:~# uname -a
Linux am62px-var-som 6.6.58-ti-g2e8c5605ae5a #1 SMP PREEMPT Sat May 10 10:02:26 UTC 2025 aarch64 GNU/Linux

root@am62px-var-som:~# echo 3 > /proc/sys/vm/drop_caches
[   62.989861] sh (1534): drop_caches: 3
root@am62px-var-som:~# dd if=/dev/zero of=/run/media/rootfs-mmcblk0p2/opt/speedtest.img oflag=direct bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 19.5624 s, 54.9 MB/s
root@am62px-var-som:~# echo 3 > /proc/sys/vm/drop_caches
[  167.777314] sh (1534): drop_caches: 3
root@am62px-var-som:~# dd if=/run/media/rootfs-mmcblk0p2/opt/speedtest.img of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.32458 s, 323 MB/s


uname -a
Linux am62px-var-som 6.12.17-ti-g8db51a710923 #1 SMP PREEMPT Mon Jun 23 13:52:15 UTC 2025 aarch64 GNU/Linux

root@am62px-var-som:~# echo 3 > /proc/sys/vm/drop_caches
[   78.227262] sh (1488): drop_caches: 3
root@am62px-var-som:~# dd if=/dev/zero of=/run/media/rootfs-mmcblk0p2/opt/speedtest.img oflag=direct bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 19.6088 s, 54.8 MB/s
root@am62px-var-som:~# echo 3 > /proc/sys/vm/drop_caches
[  112.014241] sh (1488): drop_caches: 3
root@am62px-var-som:~# dd if=/run/media/rootfs-mmcblk0p2/opt/speedtest.img of=/dev/null bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 5.95264 s, 180 MB/s

您能帮助我了解 SDK 11_00_09_04 的 eMMC 读取性能为什么  低于 SDK 10_01_10_04  吗?

是否预计会出现这种行为?

以下是指向 VAR-AM62P SOM 器件树的链接:

SDK 11.00.09.04:  k3-am62p5-var-sm.dtsi

SDK 10.01.10.04:  k3-am62p5-var-sm.dtsi

谢谢

不等

Francescp