high load in KVM when network is used (stable/10)
Bryan Venteicher
bryanv at daemoninthecloset.org
Tue May 6 15:06:14 UTC 2014
----- Original Message -----
> From: "Armin Pirkovitsch" <sperber at FreeBSD.org>
> To: stable at freebsd.org
> Sent: Monday, May 5, 2014 2:18:39 PM
> Subject: high load in KVM when network is used (stable/10)
>
> Hi,
>
> has anyone ever experienced a problem with FreeBSD 10 (release as well
> as stable) in KVMs? (in relation to network activity)
>
> Currently the load of my server goes up when I just fetch a file.
>
> systat -vmstat
> > 3 users Load 0.57 0.28 0.28 May 5 21:04
> >
> > Mem:KB REAL VIRTUAL VN PAGER SWAP
> > PAGER
> > Tot Share Tot Share Free in out in
> > out
> > Act 714476 27764 2951164 33696 14130k count
> > All 2002012 83188 3211064 209272 pages
> > Proc: Interrupts
> > r p d s w Csw Trp Sys Int Sof Flt ioflt 4575 total
> > 2 102 11k 17 25k 4046 38 cow
> > atkbd0 1
> > zfod uhci0
> > 11
> > 28.6%Sys 14.3%Intr 1.4%User 0.0%Nice 55.7%Idle ozfod ata1
> > 15
> > | | | | | | | | | | %ozfod 121
> > | | | | | | | | | | cpu0:timer
> > ==============+++++++> daefr 3255
> > virtio_pci
> > dtbuf prcfr
> > virtio_pci
> > Namei Name-cache Dir-cache 350329 desvn totfr 790
> > virtio_pci
> > Calls hits % hits % 6556 numvn react 116
> > cpu3:timer
> > 6 6 100 4181 frevn pdwak 185
> > cpu2:timer
> > 210 pdpgs 108
> > cpu1:timer
> > Disks vtbd0 cd0 pass0 intrn
> > KB/t 120 0.00 0.00 1382576 wire
> > tps 788 0 0 504540 act
> > MB/s 92.55 0.00 0.00 291232 inact
> > %busy 49 0 0 cache
> > 14130808 free
> > buf
>
> it's even worse when I access apache on that server:
> > 3 users Load 4.63 1.33 0.66 May 5 21:06
> >
> > Mem:KB REAL VIRTUAL VN PAGER SWAP
> > PAGER
> > Tot Share Tot Share Free in out in
> > out
> > Act 727760 27764 2938852 33696 14116k count
> > All 2015420 83188 3198752 209272 pages
> > Proc: Interrupts
> > r p d s w Csw Trp Sys Int Sof Flt ioflt 8 total
> > 103 14 4 49 2 1 cow
> > atkbd0 1
> > zfod uhci0
> > 11
> > 68.8%Sys 31.2%Intr 0.0%User 0.0%Nice 0.0%Idle ozfod ata1
> > 15
> > | | | | | | | | | | %ozfod 1
> > | | | | | | | | | | cpu0:timer
> > ==================================++++++++++++++++ daefr 4
> > virtio_pci
> > dtbuf prcfr
> > virtio_pci
> > Namei Name-cache Dir-cache 350329 desvn totfr 1
> > virtio_pci
> > Calls hits % hits % 6557 numvn react
> > cpu3:timer
> > 6 6 100 4136 frevn pdwak 1
> > cpu2:timer
> > 136 pdpgs 1
> > cpu1:timer
> > Disks vtbd0 cd0 pass0 intrn
> > KB/t 128 0.00 0.00 1382808 wire
> > tps 1 0 0 506072 act
> > MB/s 0.11 0.00 0.00 303460 inact
> > %busy 33 0 0 cache
> > 14116816 free
> > buf
>
> and you couldn't say that it just hasn't got enough power...
> ...
> > CPU: Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz (2000.01-MHz K8-class CPU)
> > Origin = "GenuineIntel" Id = 0x206d7 Family = 0x6 Model = 0x2d
> > Stepping = 7
> > Features=0xf83fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,SS>
> > Features2=0x9eb82203<SSE3,PCLMULQDQ,SSSE3,CX16,SSE4.1,SSE4.2,x2APIC,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,HV>
> > AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
> > AMD Features2=0x1<LAHF>
> > real memory = 17179869184 (16384 MB)
> > avail memory = 16597995520 (15829 MB)
> > Event timer "LAPIC" quality 400
> > ACPI APIC Table: <BOCHS BXPCAPIC>
> > FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
> > FreeBSD/SMP: 4 package(s) x 1 core(s)
> ...
>
> Has someone any suggestions what I could do to improve the performance
> (and lower the load)?
>
This will sound a bit odd - are you using DHCP on this interface? This might
be another instance of http://www.freebsd.org/cgi/query-pr.cgi?pr=185864. If
so, can you try with either a static IP or by applying in the workaround
patch in the PR?
> Cheers
> Armin
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