From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 196527] New: Terrible KVM USB passthrough performance
Date: Fri, 28 Jul 2017 22:42:09 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=196527
Bug ID: 196527
Summary: Terrible KVM USB passthrough performance
Product: Virtualization
Version: unspecified
Kernel Version: 4.9.32
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: virtualization_kvm@kernel-bugs.osdl.org
Reporter: nazar@mokrynskyi.com
Regression: No
Host system is Alpine Linux x86_64 with kernel 4.9.32 and QEMU 2.8.1-r1.
KVM guest is LEDE with Wi-Fi adapter attached to it, chipset used is
pc-q35-2.8.
Wi-Fi adapter is USB 2.0, but inserted into USB 3.0 port on the motherboard.
CPU is Intel Celeron N3150.
The problem I'm having is that it can barely cross 30Mbps speed with this Wi-Fi
adapter, while both adapter acting as an AP and client device can handle up to
300Mbps, well within USB 2.0 spec and well above what I'm currently seeing.
When USB 2.0 was used in VM download speed was only 10Mpbs, when switched to
USB 3.0 it increased to 14Mbps, upload in both cases is 30-32Mbps.
There is some serious bottleneck, is this an expected level of performance or
am I missing something?
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