On Sat, Nov 16, 2024 at 12:57:33AM +0800, d tbsky wrote: > > Based on whether it is taking time in the guest or in the host you could > > theoretically try setting <driver name='qemu' discard='ignore'/> but I > > guess that would not help. > > no it won't help. I had tried that before. I tried many parameters and > also tried to set the "media type" manually at windows (the function > seems only designed for storage pools, not normal devices). > "discard_granularity=0" is the first parameter which is working. I am > glad that it works. or I can only stay with very old drivers or > replace virtio-blk with virtio-scsi. Based on your description of the situation, it honestly sounds like setting discard_granularity=0 is a workaround and what we should really have is a supported way to control whether the device shows up as HDD or SSD. I'm not sure whether this would have to be an option passed to the QEMU virtio-blk device or some tunable in the driver. I'd also be surprised if this only affected Windows. Wouldn't Linux guests likely see a similar change in how the device is presented? -- Andrea Bolognani / Red Hat / Virtualization
