https://bugzilla.kernel.org/show_bug.cgi?id=199727 Stefan Hajnoczi (stefanha@xxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |stefanha@xxxxxxxxx --- Comment #12 from Stefan Hajnoczi (stefanha@xxxxxxxxx) --- Hi, I contribute to QEMU and have encountered similar issues in the past. QEMU configuration options that should allow you to avoid this issue and it sounds like you have found options that work for you. If io_submit(2) is blocking with aio=native, try aio=io_uring. If that is not available (older kernels), use aio=threads to work around this particular problem. I recommend cache=none. Although cache=writeback can shift the problem around it doesn't solve it and leaves the VMs open to unpredictable performance (including I/O stalls like this) due to host memory pressure and host page cache I/O. Regarding the original bug report, it's a limitation of that particular QEMU configuration. I don't think anything will be done about it in the Linux kernel. Maybe Proxmox can adjust the QEMU configuration to avoid it. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
