On Sun, Apr 4, 2021 at 12:53 AM Chris Murphy <li...@colorremedies.com> wrote:
> On Sat, Apr 3, 2021 at 1:32 PM Richard Shaw <hobbes1...@gmail.com> wrote: > > > > I just setup a Windows 10 to do some debugging of a mingw project. Gnome > Boxes made the process very simple but the performance is horrendous. > > > > Even after the following I still wouldn't consider it usable. > > > > # chattr +C ~/.local/share/gnome-boxes/images > > # cd ~/.local/share/gnome-boxes/images > > # mv win10 ../ > > # cat ../win10 win10 > > > > $ lsattr > > ---------------C---- ./win10 > > > > Here's a screenshot showing windows process manager with < 1MB transfer > rates but 100% disk busy while installing MinGW w64 in windows, which is > not a huge amount of data... > > > > > https://www.dropbox.com/s/2m0p3lptbqwd7lp/Screenshot%20from%202021-04-03%2014-22-02.png > > > > Any tips? Or do I just need to buy a cheap SSD and format it EXT4 just > for virtual machine images? > > Pretty sure GNOME Boxes creates sparse qcow2 files, and virt-manager > creates them with option preallocation=falloc, so this is worth a > shot. I'm not sure it can account for all of the performance loss > though. > The virtio drivers helped quite a bit, at least enough to be "acceptable" for my current use case, although the program is exiting without a stack trace, but that's another thread all together. > Check the configuration 'virsh dumpxml $vmname > vmname.xml' and see > if it's using IDE or SATA for the drive. It is possible to use VirtIO > for Windows after you've installed the VirtIO drivers for Windows and > the performance is much better. > $ virsh dumpxml win10 | grep -i sata <target dev='hdc' bus='sata'/> <controller type='sata' index='0'> > I'm reluctant to outright recommend what I use, cache mode unsafe, but > it performs a *lot* better. But if the host crashes, the VM image can > be damaged beyond repair. If the guest crashes, it should be OK. (I > force quit VMs all the time, mainly because I am trying to damage file > systems.) > I can always create a poor man's snapshot and create a xz archive of the image. It's mostly throw away except all the windows updates even using the latest Win10 ISO. I think the default cache mode for GNOME Boxes is none. It is possible > to change it via virsh to writeback and see if that's better or worse. > And if it's better then that maybe could become the default for > Windows guests. I don't expect unsafe could ever be a default. > > https://documentation.suse.com/sles/11-SP4/html/SLES-kvm4zseries/cha-qemu-cachemodes.html Thanks, I'll give it a try and report back here. Richard
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