From: Peter Lieven <pl@dlhnet.de>
To: Peter Lieven <lieven-lists@dlhnet.de>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jan Kiszka <jan.kiszka@web.de>,
Dietmar Maurer <dietmar@proxmox.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores
Date: Tue, 13 Nov 2012 12:49:03 +0100 [thread overview]
Message-ID: <50A233AF.70107@dlhnet.de> (raw)
In-Reply-To: <6c17c45c1439f217b36df2c78f0a04e6.squirrel@ssl.dlhnet.de>
On 09.11.2012 19:03, Peter Lieven wrote:
> Remark:
> If i disable interrupts on CPU1-3 for virtio the performance is ok again.
>
> Now we need someone with deeper knowledge of the in-kernel irqchip and the
> virtio/vhost driver development to say if this is a regression in qemu-kvm
> or a problem with the old virtio drivers if they receive the interrupt on
> different CPUs.
anyone?
>
> Peter Lieven wrote:
>> it seems that with in-kernel irqchip the interrupts are distributed across
>> all vpcus. without in-kernel irqchip all interrupts are on cpu0. maybe
>> this is related.
>>
>> without inkernel irqchip
>> CPU0 CPU1 CPU2 CPU3
>> 0: 16 0 0 0 IO-APIC-edge timer
>> 1: 23 0 0 0 IO-APIC-edge i8042
>> 4: 1 0 0 0 IO-APIC-edge
>> 6: 4 0 0 0 IO-APIC-edge
>> floppy
>> 7: 0 0 0 0 IO-APIC-edge
>> parport0
>> 8: 0 0 0 0 IO-APIC-edge rtc0
>> 9: 0 0 0 0 IO-APIC-fasteoi acpi
>> 11: 76 0 0 0 IO-APIC-fasteoi
>> uhci_hcd:usb1
>> 12: 102 0 0 0 IO-APIC-edge i8042
>> 14: 0 0 0 0 IO-APIC-edge
>> ata_piix
>> 15: 16881 0 0 0 IO-APIC-edge
>> ata_piix
>> 24: 0 0 0 0 PCI-MSI-edge
>> virtio1-config
>> 25: 5225 0 0 0 PCI-MSI-edge
>> virtio1-requests
>> 26: 0 0 0 0 PCI-MSI-edge
>> virtio0-config
>> 27: 72493 0 0 0 PCI-MSI-edge
>> virtio0-input
>> ...
>>
>> with inkernel irqchip
>> CPU0 CPU1 CPU2 CPU3
>> 0: 16 0 0 0 IO-APIC-edge timer
>> 1: 0 3 3 1 IO-APIC-edge i8042
>> 4: 0 0 1 0 IO-APIC-edge
>> 6: 1 0 1 2 IO-APIC-edge
>> floppy
>> 7: 0 0 0 0 IO-APIC-edge
>> parport0
>> 8: 0 0 0 0 IO-APIC-edge rtc0
>> 9: 0 0 0 0 IO-APIC-fasteoi acpi
>> 11: 7 9 4 1 IO-APIC-fasteoi
>> uhci_hcd:usb1
>> 12: 30 27 29 34 IO-APIC-edge i8042
>> 14: 0 0 0 0 IO-APIC-edge
>> ata_piix
>> 15: 943 937 950 943 IO-APIC-edge
>> ata_piix
>> 24: 0 0 0 0 PCI-MSI-edge
>> virtio0-config
>> 25: 930 978 980 947 PCI-MSI-edge
>> virtio0-input
>> 26: 0 0 1 0 PCI-MSI-edge
>> virtio0-output
>> 27: 0 0 0 0 PCI-MSI-edge
>> virtio1-config
>> 28: 543 541 542 553 PCI-MSI-edge
>> virtio1-requests
>> ...
>>
>>
>
next prev parent reply other threads:[~2012-11-13 11:49 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-05 11:51 [Qemu-devel] slow virtio network with vhost=on and multiple cores Dietmar Maurer
2012-11-05 12:36 ` Stefan Hajnoczi
2012-11-05 15:01 ` Dietmar Maurer
2012-11-06 6:12 ` Dietmar Maurer
2012-11-06 7:46 ` Peter Lieven
2012-11-06 7:51 ` Dietmar Maurer
2012-11-06 9:01 ` Dietmar Maurer
2012-11-06 9:26 ` Jan Kiszka
2012-11-06 9:46 ` Dietmar Maurer
2012-11-06 10:12 ` Jan Kiszka
2012-11-06 11:24 ` Dietmar Maurer
2012-11-08 9:39 ` Jan Kiszka
2012-11-08 10:55 ` Peter Lieven
2012-11-08 12:03 ` Dietmar Maurer
2012-11-08 15:02 ` Peter Lieven
2012-11-09 5:55 ` Dietmar Maurer
2012-11-09 17:27 ` Peter Lieven
2012-11-09 17:51 ` Peter Lieven
2012-11-09 18:03 ` Peter Lieven
2012-11-13 11:44 ` Peter Lieven
2012-11-13 11:49 ` Peter Lieven [this message]
2012-11-13 16:22 ` Michael S. Tsirkin
2012-11-13 16:21 ` Peter Lieven
2012-11-13 16:26 ` Michael S. Tsirkin
2012-11-13 16:27 ` Peter Lieven
2012-11-13 16:59 ` Dietmar Maurer
2012-11-13 17:03 ` Michael S. Tsirkin
2012-11-13 16:33 ` Michael S. Tsirkin
2012-11-13 16:35 ` Peter Lieven
2012-11-13 16:46 ` Michael S. Tsirkin
2012-11-13 17:03 ` Dietmar Maurer
2012-11-13 17:07 ` Michael S. Tsirkin
2012-11-13 17:38 ` Dietmar Maurer
2012-11-15 18:26 ` Peter Lieven
2012-11-16 10:44 ` Dietmar Maurer
2012-11-16 11:00 ` Alexandre DERUMIER
2012-12-03 11:23 ` Peter Lieven
2012-12-09 18:38 ` Alexandre DERUMIER
2013-03-14 9:22 ` Davide Guerri
2013-03-14 10:43 ` Alexandre DERUMIER
2013-03-14 17:50 ` Michael S. Tsirkin
2013-03-14 18:15 ` Davide Guerri
2013-03-14 18:21 ` Peter Lieven
2013-03-14 23:04 ` Davide Guerri
2013-03-15 7:23 ` Peter Lieven
2013-03-17 9:08 ` Michael S. Tsirkin
2013-03-18 9:50 ` Alexandre DERUMIER
2013-03-18 9:53 ` Michael S. Tsirkin
2013-03-25 13:34 ` Peter Lieven
2012-11-19 13:49 ` Peter Lieven
2012-11-06 6:48 ` Dietmar Maurer
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