893310 – app-emulation/qemu-7.2: virtio-blk-pci I/O errors with detect-zeroes=unmap

Bug 893310 - app-emulation/qemu-7.2: virtio-blk-pci I/O errors with detect-zeroes=unmap

Summary: app-emulation/qemu-7.2: virtio-blk-pci I/O errors with detect-zeroes=unmap

Status:	UNCONFIRMED

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	Current packages (show other bugs)
Hardware:	AMD64 Linux

Importance:	Normal normal (vote)
Assignee:	Virtualization Team

URL:
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Keywords:

Depends on:
Blocks:

Reported:	2023-02-05 18:28 UTC by morpheus
Modified:	2023-02-05 18:33 UTC (History)
CC List:	1 user (show)

See Also:	https://gitlab.com/qemu-project/qemu/-/issues/1404
Package list:
Runtime testing required:	---

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Description morpheus 2023-02-05 18:28:19 UTC

Since qemu-7.2.0 went stable, I am facing really slow disk I/O with a qcow2 image connected via virtio with the option detect-zeroes=unmap. 

Windows 10 guests are so slow, that you can not install anything new. Disk I/O is measured in seconds. 

Linux guests sometimes corrupt the file system.

The issue is known at the qemu project. See the following URL: 

https://gitlab.com/qemu-project/qemu/-/issues/1404