On Wed, Jan 10, 2018 at 03:51:19PM +0000, Mark Carroll wrote: > Since my hosting provider https://www.bytemark.co.uk/cloud-hosting/ > patched for Meltdown last weekend I'm seeing significant performance > issues with an OpenBSD virtual instance there. It seems okay after a > fresh reboot but then progressively returns to being very slow: for > example "sleep 1" may take four seconds, then five, six, seven, then > rather more. Curiously it does tend to be an integral multiplier. > > I wondered, is anybody else seeing significant performance problems with > OpenBSD (or other BSDs) virtual instances since Meltdown patching? Is > there anything to tweak at my end or am I reliant on the provider? > > -- Mark >
There are a ton of threads talking about this issue, and it's not meltdown specific. Please search the archives. -ml > > OpenBSD 6.1 (GENERIC) #26: Wed Oct 4 18:41:35 CEST 2017 > > [email protected]:/usr/src/sys/arch/amd64/compile/GENERIC > real mem = 1055870976 (1006MB) > avail mem = 1019322368 (972MB) > mpath0 at root > scsibus0 at mpath0: 256 targets > mainbus0 at root > bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xf1c10 (10 entries) > bios0: vendor Bochs version "Bochs" date 01/01/2011 > bios0: Bochs Bochs > acpi0 at bios0: rev 0 > acpi0: sleep states S3 S4 S5 > acpi0: tables DSDT FACP SSDT APIC HPET > acpi0: wakeup devices > acpitimer0 at acpi0: 3579545 Hz, 24 bits > acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat > cpu0 at mainbus0: apid 0 (boot processor) > cpu0: QEMU Virtual CPU version 2.1.3, 2200.42 MHz > cpu0: > FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,SSE3,CX16,POPCNT,HV,NXE,LONG,LAHF > cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 512KB > 64b/line 16-way L2 cache > cpu0: ITLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped > cpu0: DTLB 255 4KB entries direct-mapped, 255 4MB entries direct-mapped > cpu0: smt 0, core 0, package 0 > mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges > cpu0: apic clock running at 1000MHz > ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins > acpihpet0 at acpi0: 100000000 Hz > acpiprt0 at acpi0: bus 0 (PCI0) > acpicpu0 at acpi0: C1(@1 halt!) > "ACPI0006" at acpi0 not configured > "PNP0303" at acpi0 not configured > "PNP0F13" at acpi0 not configured > "PNP0700" at acpi0 not configured > "PNP0400" at acpi0 not configured > "PNP0501" at acpi0 not configured > "ACPI0007" at acpi0 not configured > pvbus0 at mainbus0: KVM > pci0 at mainbus0 bus 0 > pchb0 at pci0 dev 0 function 0 "Intel 82441FX" rev 0x02 > pcib0 at pci0 dev 1 function 0 "Intel 82371SB ISA" rev 0x00 > pciide0 at pci0 dev 1 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 > wired to compatibility, channel 1 wired to compatibility > pciide0: channel 0 disabled (no drives) > atapiscsi0 at pciide0 channel 1 drive 0 > scsibus1 at atapiscsi0: 2 targets > cd0 at scsibus1 targ 0 lun 0: <QEMU, QEMU DVD-ROM, 2.1.> ATAPI 5/cdrom > removable > cd0(pciide0:1:0): using PIO mode 4, DMA mode 2 > uhci0 at pci0 dev 1 function 2 "Intel 82371SB USB" rev 0x01: apic 0 int 11 > piixpm0 at pci0 dev 1 function 3 "Intel 82371AB Power" rev 0x03: apic 0 int 9 > iic0 at piixpm0 > vga1 at pci0 dev 2 function 0 "Cirrus Logic CL-GD5446" rev 0x00 > wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) > wsdisplay0: screen 1-5 added (80x25, vt100 emulation) > virtio0 at pci0 dev 3 function 0 "Qumranet Virtio Network" rev 0x00 > vio0 at virtio0: address fe:ff:00:00:4f:1a > virtio0: msix shared > virtio1 at pci0 dev 4 function 0 "Qumranet Virtio Memory" rev 0x00 > viomb0 at virtio1 > virtio1: apic 0 int 11 > virtio2 at pci0 dev 5 function 0 "Qumranet Virtio Storage" rev 0x00 > vioblk0 at virtio2 > scsibus2 at vioblk0: 2 targets > sd0 at scsibus2 targ 0 lun 0: <VirtIO, Block Device, > SCSI3 0/direct fixed > sd0: 25600MB, 512 bytes/sector, 52428800 sectors > virtio2: msix shared > "Intel 6300ESB WDT" rev 0x00 at pci0 dev 6 function 0 not configured > isa0 at pcib0 > isadma0 at isa0 > fdc0 at isa0 port 0x3f0/6 irq 6 drq 2 > fd0 at fdc0 drive 1: density unknown > com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo > com0: console > pckbc0 at isa0 port 0x60/5 irq 1 irq 12 > pckbd0 at pckbc0 (kbd slot) > wskbd0 at pckbd0: console keyboard, using wsdisplay0 > pms0 at pckbc0 (aux slot) > wsmouse0 at pms0 mux 0 > pcppi0 at isa0 port 0x61 > spkr0 at pcppi0 > lpt0 at isa0 port 0x378/4 irq 7 > usb0 at uhci0: USB revision 1.0 > uhub0 at usb0 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 > addr 1 > uhidev0 at uhub0 port 1 configuration 1 interface 0 "QEMU QEMU USB Tablet" > rev 1.00/0.00 addr 2 > uhidev0: iclass 3/0 > ums0 at uhidev0: 3 buttons, Z dir > wsmouse1 at ums0 mux 0 > vscsi0 at root > scsibus3 at vscsi0: 256 targets > softraid0 at root > scsibus4 at softraid0: 256 targets > root on sd0a (312946608d4051a2.a) swap on sd0b dump on sd0b >
