Date: Tue, 6 May 2014 09:59:41 -0500 (CDT) From: Bryan Venteicher <bryanv@daemoninthecloset.org> To: Armin Pirkovitsch <sperber@FreeBSD.org> Cc: stable@freebsd.org Subject: Re: high load in KVM when network is used (stable/10) Message-ID: <743840238.35506.1399388381208.JavaMail.root@daemoninthecloset.org> In-Reply-To: <5367E40F.1060308@FreeBSD.org> References: <5367E40F.1060308@FreeBSD.org>
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----- Original Message ----- > From: "Armin Pirkovitsch" <sperber@FreeBSD.org> > To: stable@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 > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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