Stefan Hajnoczi 1436f32a84 virtio-pci: add virtio_pci_optimal_num_queues() helper ... Multi-queue devices achieve the best performance when each vCPU has a dedicated queue. This ensures that virtqueue used notifications are handled on the same vCPU that submitted virtqueue buffers. When another vCPU handles the the notification an IPI will be necessary to wake the submission vCPU and this incurs a performance overhead. Provide a helper function that virtio-pci devices will use in later patches to automatically select the optimal number of queues. The function handles guests with large numbers of CPUs by limiting the number of queues to fit within the following constraints: 1. The maximum number of MSI-X vectors. 2. The maximum number of virtqueues. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20200818143348.310613-4-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>		2020-08-27 08:29:13 -04:00
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9pfs	9pfs: Fix severe performance issue of Treaddir requests.	2020-08-24 16:39:53 +01:00
acpi	Introduce a new flag for i440fx to disable PCI hotplug on the root bus	2020-08-27 08:29:08 -04:00
adc	meson: convert hw/adc	2020-08-21 06:30:32 -04:00
alpha	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
arm	arm/acpi: fix an out of spec _UID for PCI root	2020-08-27 08:27:48 -04:00
audio	meson: convert hw/audio	2020-08-21 06:30:32 -04:00
avr	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
block	meson: convert hw/block	2020-08-21 06:30:32 -04:00
char	meson: convert hw/char	2020-08-21 06:30:32 -04:00
core	Machine queue 2020-08-19	2020-08-22 14:37:31 +01:00
cpu	hw/cpu/a9mpcore: Verify the machine use Cortex-A9 cores	2020-08-24 10:01:40 +01:00
cris	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
display	artist out of bounds fixes	2020-08-26 22:23:53 +01:00
dma	meson: convert hw/dma	2020-08-21 06:30:31 -04:00
gpio	meson: convert hw/gpio	2020-08-21 06:30:31 -04:00
hppa	artist out of bounds fixes	2020-08-26 22:23:53 +01:00
hyperv	meson: convert hw/hyperv	2020-08-21 06:30:31 -04:00
i2c	meson: convert hw/i2c	2020-08-21 06:30:30 -04:00
i386	i386/acpi: fix inconsistent QEMU/OVMF device paths	2020-08-27 08:27:48 -04:00
ide	meson: convert hw/ide	2020-08-21 06:30:30 -04:00
input	meson: convert hw/input	2020-08-21 06:30:30 -04:00
intc	ppc patch queue 2020-08-18	2020-08-24 09:35:21 +01:00
ipack	meson: convert hw/ipack	2020-08-21 06:30:30 -04:00
ipmi	meson: convert hw/ipmi	2020-08-21 06:30:29 -04:00
isa	meson: convert hw/isa	2020-08-21 06:30:29 -04:00
lm32	hw/sd/milkymist: Do not create SD card within the SD host controller	2020-08-21 16:22:43 +02:00
m68k	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
mem	meson: convert hw/mem	2020-08-21 06:30:26 -04:00
microblaze	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
mips	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
misc	meson: convert hw/misc	2020-08-21 06:30:29 -04:00
moxie	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
net	meson: convert hw/net	2020-08-21 06:30:29 -04:00
nios2	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
nubus	meson: convert hw/nubus	2020-08-21 06:30:25 -04:00
nvram	ppc patch queue 2020-08-18	2020-08-24 09:35:21 +01:00
openrisc	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
pci	meson: convert hw/pci	2020-08-21 06:30:28 -04:00
pci-bridge	meson: convert hw/pci-bridge	2020-08-21 06:30:28 -04:00
pci-host	meson: convert hw/pci-host	2020-08-21 06:30:28 -04:00
pcmcia	meson: convert hw/pcmcia	2020-08-21 06:30:28 -04:00
ppc	ppc patch queue 2020-08-18	2020-08-24 09:35:21 +01:00
rdma	meson: convert hw/rdma	2020-08-21 06:30:29 -04:00
riscv	hw/riscv: virt: Allow creating multiple NUMA sockets	2020-08-25 09:11:35 -07:00
rtc	meson: convert hw/rtc	2020-08-21 06:30:27 -04:00
rx	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
s390x	Machine queue 2020-08-19	2020-08-22 14:37:31 +01:00
scsi	meson: convert hw/scsi	2020-08-21 06:30:28 -04:00
sd	hw/sd: Correct the maximum size of a Standard Capacity SD Memory Card	2020-08-21 16:49:22 +02:00
semihosting	meson: convert hw/semihosting	2020-08-21 06:30:25 -04:00
sh4	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
smbios	meson: convert hw/smbios	2020-08-21 06:30:25 -04:00
sparc	ppc patch queue 2020-08-18	2020-08-24 09:35:21 +01:00
sparc64	ppc patch queue 2020-08-18	2020-08-24 09:35:21 +01:00
ssi	meson: convert hw/ssi	2020-08-21 06:30:27 -04:00
timer	meson: convert hw/timer	2020-08-21 06:30:27 -04:00
tpm	meson: convert hw/tpm	2020-08-21 06:30:27 -04:00
tricore	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
unicore32	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
usb	meson: convert hw/usb	2020-08-21 06:30:26 -04:00
vfio	meson: convert hw/vfio	2020-08-21 06:30:26 -04:00
virtio	virtio-pci: add virtio_pci_optimal_num_queues() helper	2020-08-27 08:29:13 -04:00
watchdog	meson: convert hw/watchdog	2020-08-21 06:30:26 -04:00
xen	meson: convert hw/xen	2020-08-21 06:30:24 -04:00
xenpv	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00
xtensa	target/xtensa: implement NMI support	2020-08-21 12:48:14 -07:00
Kconfig	hw/avr: Add limited support for some Arduino boards	2020-07-11 11:02:05 +02:00
meson.build	meson: convert hw/arch*	2020-08-21 06:30:33 -04:00