Hi Rasmus On Tue, Dec 15, 2015 at 03:20:05PM +0100, Rasmus Edgar wrote: > We started noticing 1s+ latency problems on clients resolving using the > vmware guest at a load around 6000 qps. > > Test setup: > > 1 x x86_64 vmware guest on Esx 5.5 > 8xVCPU > 8G RAM > vmxnet3 10Gb virtual interface > CentOS 7.1 > Bind 9.10.3 resolver > > 1xIBM x86_64 physical machine > 24xCPU cores > 16G ram > 1Gb interface > CentOS 7.1 > Bind 9.10.3 resolver
Generally VMs are not a proper place to test query performance, but
anyway let's see. When named starts, it logs messages like this:
15-Dec-2015 20:08:00.245 found 8 CPUs, using 8 worker threads
15-Dec-2015 20:08:00.245 using 7 UDP listeners per interface
15-Dec-2015 20:08:00.245 using up to 4096 sockets
Please will you paste what you get in your configuration?
> ./dnsperf -f inet -s <redacted ip> -d queryfile-example-10million-201202 -l
> 30 -q 15000
Why are you passing the -q argument to dnsperf?
A high receive queue means your named process is not able to read off
the socket fast enough. Try to find out where it's busy, using a
profiler such as perf. Is it query logging or doing some other highly
verbose logging that keeps it blocked in disk IO?
Mukund
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