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[qemu-s390x] qemu-system-s390x slowdown (regression ?) with qemu v4.0.0

From: Guenter Roeck
Subject: [qemu-s390x] qemu-system-s390x slowdown (regression ?) with qemu v4.0.0
Date: Wed, 12 Jun 2019 13:03:30 -0700
User-agent: Mutt/1.5.24 (2015-08-30)


I noticed that qemu-system-s390x is much slower when running qemu v4.0.0
vs. qemu v3.1.0. Specifically, on a system with Ryzen 2700X, a boot test
has a runtime of ~25 seconds with qemu v3.1.0, but ~67 seconds with qemu
v4.0.0.  Mainline qemu as of today (6/12) is even worse, with a runtime
of ~73 seconds.
All of this is booting exactly the same kernel and root file system.
All qemu versions are compiled locally with gcc 6.5.0, with the same
configuration options enabled.

Is this a known problem ?


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