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    SubjectRE: [RFC PATCH] mmc: core: Disable REQ_FUA if the eMMC supports an internal cache
    Date
    Hi,
    > I have benchmarked the FUA/Cache behavior a bit.
    > I don't have an actual filesystem benchmark that does what I wanted and is
    > easy to port to the target so I used:
    I guess I'm a bit late here - sorry about that.
    If you happened to have traces of the below runs - I'll be happy to provide further analysis.

    You might also want to look into fio which allows you do write to a raw block device,
    And has various sync options - so you are much more in control of the payload size
    And how many reliable-writes / sync-caches were issued - if any.

    Thanks,
    Avri

    > # call with
    > # for loop in {1..3}; do sudo dd if=/dev/urandom bs=1M of=/dev/mmcblk2;
    > done; for loop in {1..5}; do time ./filesystembenchmark.sh; umount /mnt;
    > done
    > mkfs.ext4 -F /dev/mmcblk2
    > mount /dev/mmcblk2 /mnt
    > for i in {1..3}
    > do
    > cp -r linux-6.2.2 /mnt/$i
    > done
    > for i in {1..3}
    > do
    > rm -r /mnt/$i
    > done
    > for i in {1..3}
    > do
    > cp -r linux-6.2.2 /mnt/$i
    > done
    >
    >
    > I found a couple of DUTs that I can link, I also tested one industrial card.
    >
    > DUT1: blue PCB Foresee eMMC
    > https://pine64.com/product/32gb-emmc-module/
    > DUT2: green PCB SiliconGo eMMC
    > Couldn't find that one online anymore unfortunately
    > DUT3: orange hardkernel PCB 8GB
    > https://www.hardkernel.com/shop/8gb-emmc-module-c2-android/
    > DUT4: orange hardkernel PCB white dot
    > https://rlx.sk/en/odroid/3198-16gb-emmc-50-module-xu3-android-for-
    > odroid-xu3.html
    > DUT5: Industrial card
    >
    >
    > The test issued 461 DO_REL_WR during one of the iterations for DUT5
    >
    > DUT1:
    > Cache, no FUA:
    > 13:04.49
    > 13:13.82
    > 13:30.59
    > 13:28:13
    > 13:20:64
    > FUA:
    > 13:30.32
    > 13:36.26
    > 13:10.86
    > 13:32.52
    > 13:48.59
    >
    > DUT2:
    > FUA:
    > 8:11.24
    > 7:47.73
    > 7:48.00
    > 7:48.18
    > 7:47.38
    > Cache, no FUA:
    > 8:10.30
    > 7:48.97
    > 7:48.47
    > 7:47.93
    > 7:44.18
    >
    > DUT3:
    > Cache, no FUA:
    > 7:02.82
    > 6:58.94
    > 7:03.20
    > 7:00.27
    > 7:00.88
    > FUA:
    > 7:05.43
    > 7:03.44
    > 7:04.82
    > 7:03.26
    > 7:04.74
    >
    > DUT4:
    > FUA:
    > 7:23.92
    > 7:20.15
    > 7:20.52
    > 7:19.10
    > 7:20.71
    > Cache, no FUA:
    > 7:20.23
    > 7:20.48
    > 7:19.94
    > 7:18.90
    > 7:19.88
    >
    > Cache, no FUA:
    > 7:19.36
    > 7:02.11
    > 7:01.53
    > 7:01.35
    > 7:00.37
    > Cache, no FUA CQE:
    > 7:17.55
    > 7:00.73
    > 6:59.25
    > 6:58.44
    > 6:58.60
    > FUA:
    > 7:15.10
    > 6:58.99
    > 6:58.94
    > 6:59.17
    > 6:60.00
    > FUA CQE:
    > 7:11.03
    > 6:58.04
    > 6:56.89
    > 6:56.43
    > 6:56:28
    >
    > If anyone has any comments or disagrees with the benchmark, or has a
    > specific eMMC to test, let me know.
    >
    > Regards,
    > Christian
    >
    > Hyperstone GmbH | Reichenaustr. 39a | 78467 Konstanz Managing Director:
    > Dr. Jan Peter Berns.
    > Commercial register of local courts: Freiburg HRB381782

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