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Caleb Raitto says: ==================== virtio_net: Expand affinity to arbitrary numbers of cpu and vq Virtio-net tries to pin each virtual queue rx and tx interrupt to a cpu if there are as many queues as cpus. Expand this heuristic to configure a reasonable affinity setting also when the number of cpus != the number of virtual queues. Patch 1 allows vqs to take an affinity mask with more than 1 cpu. Patch 2 generalizes the algorithm in virtnet_set_affinity beyond the case where #cpus == #vqs. v2 changes: Renamed "virtio_net: Make vp_set_vq_affinity() take a mask." to "virtio: Make vp_set_vq_affinity() take a mask." Tested: [InstanceSetup] set_multiqueue = false $ cd /proc/irq $ for i in `seq 24 60` ; do sudo grep ".*" $i/smp_affinity_list; done 0-15 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 0-15 0-15 0-15 0-15 $ cd /sys/class/net/eth0/queues/ $ for i in `seq 0 15` ; do sudo grep ".*" tx-$i/xps_cpus; done 0001 0002 0004 0008 0010 0020 0040 0080 0100 0200 0400 0800 1000 2000 4000 8000 $ sudo ethtool -L eth0 combined 15 $ cd /proc/irq $ for i in `seq 24 60` ; do sudo grep ".*" $i/smp_affinity_list; done 0-15 0-1 0-1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 15 15 0-15 0-15 0-15 0-15 $ cd /sys/class/net/eth0/queues/ $ for i in `seq 0 14` ; do sudo grep ".*" tx-$i/xps_cpus; done 0003 0004 0008 0010 0020 0040 0080 0100 0200 0400 0800 1000 2000 4000 8000 $ sudo ethtool -L eth0 combined 8 $ cd /proc/irq $ for i in `seq 24 60` ; do sudo grep ".*" $i/smp_affinity_list; done 0-15 0-1 0-1 2-3 2-3 4-5 4-5 6-7 6-7 8-9 8-9 10-11 10-11 12-13 12-13 14-15 14-15 9 9 10 10 11 11 12 12 13 13 14 14 15 15 15 15 0-15 0-15 0-15 0-15 $ cd /sys/class/net/eth0/queues/ $ for i in `seq 0 7` ; do sudo grep ".*" tx-$i/xps_cpus; done 0003 000c 0030 00c0 0300 0c00 3000 c000 $ sudo ethtool -L eth0 combined 16 $ sudo sh -c "echo 0 > /sys/devices/system/cpu/cpu15/online" $ cd /proc/irq $ for i in `seq 24 60` ; do sudo grep ".*" $i/smp_affinity_list; done 0-15 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 0 0 0-15 0-15 0-15 0-15 $ cd /sys/class/net/eth0/queues/ $ for i in `seq 0 15` ; do sudo grep ".*" tx-$i/xps_cpus; done 0001 0002 0004 0008 0010 0020 0040 0080 0100 0200 0400 0800 1000 2000 4000 0001 $ for i in `seq 8 15`; \ do sudo sh -c "echo 0 > /sys/devices/system/cpu/cpu$i/online"; done $ cd /proc/irq $ for i in `seq 24 60` ; do sudo grep ".*" $i/smp_affinity_list; done 0-15 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 0-15 0-15 0-15 0-15 $ cd /sys/class/net/eth0/queues/ $ for i in `seq 0 15` ; do sudo grep ".*" tx-$i/xps_cpus; done 0001 0002 0004 0008 0010 0020 0040 0080 0001 0002 0004 0008 0010 0020 0040 0080 ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ There are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. Please read Documentation/admin-guide/README.rst first. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. The formatted documentation can also be read online at: https://www.kernel.org/doc/html/latest/ There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.