ping, I've not received any reaction on this series[1]. Is there anything I can do to move this forward?
Greetings, Christian [1]: https://patchew.org/QEMU/[email protected]/ On Fri, Sep 19, 2025 at 02:34:39PM +0200, Christian Speich wrote: > This patch series improves the performance of read/write/erase operations > on sdcards. > > This is done by increasing the maximum buffer size that is worked on. > >From 1 byte (master) to 512 bytes (first commit) to larger than 512 > (adma commit). > > Testing on my system with fio I see the following rough performance > values in MiB/s. > > read write readwrite > master: 6 6 3/ 3 > first commit: 51 43 23/ 23 > second commit: 392 180 144/143 > > Tested on a 2GiB raw image with: > fio --filename=/dev/mmcblk0 --direct=1 --runtime=60 --time_based --bs=128k > --rw={mode} > > The adma values are somewhat unstable but always >100MiB/s, I'm not sure > why but I guess it has something to do with the host side caching. > > For erasing the third commit changes the erase operation to write zeros, > as indicated by DATA_STAT_AFTER_ERASE in SCR. > > The fourth commit allows erasure in large blocks, to speed it up > significantly. Erasing 2GiB now takes 0.1s instead of 26s. > > Signed-off-by: Christian Speich <[email protected]> > --- > Christian Speich (4): > hw/sd: Switch from byte-wise to buf+len read/writes > hw/sd/sdhci: Don't use bounce buffer for ADMA > hw/sd/sdcard: Erase blocks to zero > hw/sd/sdcard: Erase in large blocks > > hw/sd/core.c | 16 +--- > hw/sd/sd.c | 277 > ++++++++++++++++++++++++++++++++++++++++------------- > hw/sd/sdhci.c | 102 +++++++++++--------- > include/hw/sd/sd.h | 13 +-- > 4 files changed, 277 insertions(+), 131 deletions(-) > --- > base-commit: e7c1e8043a69c5a8efa39d4f9d111f7c72c076e6 > change-id: 20250912-sdcard-performance-b4-d908bbb5a004 > > Best regards, > -- > Christian Speich <[email protected]> > >
