[PVE-User] high cpu load on 100mbits/sec download with virtio nic

[Maxime AUGER]

Thank you for your statement

I wget on the debian8 GUEST

-> GUEST-CPU = 25% of 1x vcpu
-> HOST-CPU = 30% of 2x cores (each one)

Ex with "-O /dev/null" : host TOP (the cpu decreases a little bit)
  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
 6833 root      20   0 1972312 892460   5900 S 31.1 43.7 184:54.60 /usr/bin/kvm -id 108 -name fg-v4-bench-8 -chardev socket,id=qmp,path=/var/run/qemu-server/108.qmp,server,nowait -mon chardev=qmp,mode=control -pidfile /var/run/qemu-server/108.pid -daemonize -smbios type=1,uuid=b1572470-0605-44da-9bae-0b2a6d43954a -s+ 
 6772 root      20   0       0      0      0 R 11.9  0.0   1:37.54 [vhost-6712]                                                                                                                                                                                                                                                
 6834 root      20   0 1972312 892460   5900 S  7.9 43.7 173:24.10 /usr/bin/kvm -id 108 -name fg-v4-bench-8 -chardev socket,id=qmp,path=/var/run/qemu-server/108.qmp,server,nowait -mon chardev=qmp,mode=control -pidfile /var/run/qemu-server/108.pid -daemonize -smbios type=1,uuid=b1572470-0605-44da-9bae-0b2a6d43954a -s+ 
 6712 root      20   0 1972312 892460   5900 S  1.3 43.7   7:50.63 /usr/bin/kvm -id 108 -name fg-v4-bench-8 -chardev socket,id=qmp,path=/var/run/qemu-server/108.qmp,server,nowait -mon chardev=qmp,mode=control -pidfile /var/run/qemu-server/108.pid -daemonize -smbios type=1,uuid=b1572470-0605-44da-9bae-0b2a6d43954a -s+




-----Message d'origine-----
De : pve-user [mailto:pve-user-bounces at pve.proxmox.com] De la part de Mark Schouten
Envoyé : jeudi 7 juin 2018 17:03
À : PVE User List <pve-user at pve.proxmox.com>
Objet : Re: [PVE-User] high cpu load on 100mbits/sec download with virtio nic

On Thu, 2018-06-07 at 14:49 +0000, Maxime AUGER wrote:
> I'm doubtful about the performance I get.
> 
> On proxmox HOST a single wget download consume 12% single CPU load at 
> 11MBytes/sec (1518 packets size)

Where are you wgetting to? Benchmarking this is better with iperf or so.

If you want to wget, do wget -O /dev/null so you're not suffering from diskperformance..

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