You might try updating the 2nd drive's argument to `-drive file=fat:rw:dosfiles/,format=raw,cache=writeback`. [0]
[0] https://manpages.debian.org/unstable/qemu-system-x86/qemu-system-i386.1.en.html On Wed, Mar 13, 2024 at 10:29 AM h...@iafrica.com <h...@iafrica.com> wrote: > I removed CDROM and Sound support. I moved all program directories from > the D: drive (FAT16 access drive) to the C: drive and this appears to have > improved the speed to about 7x slower. I then checked to see if KVM was > running and it was. > The command line I was using to invoke the emulator was:- > $ qemu-system-i386 -m 32 -rtc base=localtime -drive > file=dos.img,index=0,media=disk,format=raw -drive > file=fat:rw:dosfiles/,format=raw -boot order=c -display sdl > I then added "-enable-kvm" > eg. > $ qemu-system-i386 -m 32 -rtc base=localtime -drive > file=dos.img,index=0,media=disk,format=raw -drive > file=fat:rw:dosfiles/,format=raw -boot order=c -display sdl -enable-kvm > This has moved speed to parity to 2x slower which is excellent. > > I have switched to the 4DOS shell with no speed penalty. In 4DOS I have > always used Function key F11 to toggle between two directories. This does > not work as QEMU appears to use F11 to toggle between current window size > and full screen. I have searched on the Internet but not found any > reference to the use off F11 in QEMU. Anyone have any ideas how to reassign > the key? I suspect it is hard coded? > > Using drive D:, the access drive, appears to be problematic. Best not to > use it other than transfer files. > > > On 2024/03/13 18:53, Louis Santillan wrote: > > What was the qemu command you used? It sounds like you paying a double > penalty somewhere for how you’re get the disk image into qemu. Loopback > devices pay some penalty. 10x seems like some option is missing to improve > performance. > > On Wed, Mar 13, 2024 at 2:57 AM hms--- via Freedos-user < > freedos-user@lists.sourceforge.net> wrote: > >> Hi All >> Some feedback. Creating a 2G image allowed me to assemble source code >> correctly. The only penalty being speed. About 6 to 11 times slower than >> running DOS under XP. >> I mounted the image and copied source files from backup directory to >> mounted C: drive. >> Lubuntu Linux error on boot up resolved. QEMU-KVM had crashed on two >> occasions and logs created in the /dev/crash directory. Deleting the log >> files in /dev/crash removed the error message on start up. >> >> I used "mount" instead of "guestmount". Steps below. >> >> Display start sector and sector size: >> $ fdisk -l dos.img >> Eg. 63 and 512 bytes. Offset = 63 * 512 = 32256 >> >> Create directory: >> $ mkdir /tmp/dos >> >> Mount image in directory: >> $ sudo mount -o loop,offset=32256 dos.img /tmp/dos >> >> Copy directories: >> Eg. >> $ cp -r /temp/source-dir /tmp/dos >> >> Unmount image: >> umount /tmp/dos >> >> John >> >> >> _______________________________________________ >> Freedos-user mailing list >> Freedos-user@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/freedos-user >> > >
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