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From: Jan Kiszka <jan.kiszka@web.de>
To: qemu-devel <qemu-devel@nongnu.org>
Cc: kvmarm <kvmarm@lists.cs.columbia.edu>, kvm <kvm@vger.kernel.org>
Subject: vexpress: Horribly slow MMC emulation on ARM host
Date: Mon, 16 Feb 2015 07:56:22 +0100	[thread overview]
Message-ID: <54E19496.6020905@web.de> (raw)


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Hi,

this basically concludes my problems of getting KVM running on the
Jetson TK1 board with QEMU: all fine now, provided I switch from

  qemu-system-arm -machine vexpress-a15 -sd disk.img ...

to

  qemu-system-arm -machine vexpress-a15 \
    -drive file=disk.img,if=none,id=disk \
    -device virtio-blk-device,drive=disk ...

This applies to both emulated and KVM accelerated mode. If I run the
same image (and guest kernel) emulated on my x86 box, there is still a
difference between both disk modes, but it's not that excessive. On ARM
the system requires minutes to boot from MMC - if it doesn't run into
timeouts earlier. It's seconds with virtio.

Known problem?

Jan


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WARNING: multiple messages have this Message-ID (diff)
From: Jan Kiszka <jan.kiszka@web.de>
To: qemu-devel <qemu-devel@nongnu.org>
Cc: kvmarm <kvmarm@lists.cs.columbia.edu>, kvm <kvm@vger.kernel.org>
Subject: [Qemu-devel] vexpress: Horribly slow MMC emulation on ARM host
Date: Mon, 16 Feb 2015 07:56:22 +0100	[thread overview]
Message-ID: <54E19496.6020905@web.de> (raw)

[-- Attachment #1: Type: text/plain, Size: 702 bytes --]

Hi,

this basically concludes my problems of getting KVM running on the
Jetson TK1 board with QEMU: all fine now, provided I switch from

  qemu-system-arm -machine vexpress-a15 -sd disk.img ...

to

  qemu-system-arm -machine vexpress-a15 \
    -drive file=disk.img,if=none,id=disk \
    -device virtio-blk-device,drive=disk ...

This applies to both emulated and KVM accelerated mode. If I run the
same image (and guest kernel) emulated on my x86 box, there is still a
difference between both disk modes, but it's not that excessive. On ARM
the system requires minutes to boot from MMC - if it doesn't run into
timeouts earlier. It's seconds with virtio.

Known problem?

Jan


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             reply	other threads:[~2015-02-16  6:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-16  6:56 Jan Kiszka [this message]
2015-02-16  6:56 ` [Qemu-devel] vexpress: Horribly slow MMC emulation on ARM host Jan Kiszka
2015-02-16  9:11 ` Peter Maydell
2015-02-16  9:11   ` [Qemu-devel] " Peter Maydell

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