Could it be that you're network limited?
In any case, the values of the following parameters may be illuminating
(they may be obtained via "rndc status").
CPUs found
worker threads
UDP listeners per interface
For example, my very lightly loaded authoritative server reports:
version: BIND 9.10.6 (Not currently available)
boot time: Fri, 12 Jan 2018 23:49:54 GMT
last configured: Wed, 21 Feb 2018 05:00:02 GMT
CPUs found: 4
worker threads: 4
UDP listeners per interface: 3
number of zones: 4
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is ON
recursive clients: 0/0/1000
tcp clients: 0/100
server is up and running
--
On Wed, 21 Feb 2018 20:59:16 +
"PENG, JUNAN" wrote:
> Hi, Tony
>
> During my performance test, I also tested the performance without
> query logs. I disabled the query log feature , but it seemed that
> QPS couldn't go higher (about 75KQPS) when CPU still had lots of
> room -- Named CPU Usage was about 250%, but in theory it can
> reach to 400% (4 vCPU).
>
>
> In your opinion, which default parameters I need pay attention to ,
> which will impact system capacity performance when query log is off?
>
>
> Our Bind version is 9.10.5. Do you know what version you think will
> have better multi-threading ?
>
>
> Thank you very much!
>
> Michael
>
> -Original Message-
> From: PENG, JUNAN
> Sent: Wednesday, February 21, 2018 11:32 AM
> To: 'Tony Finch'
> Subject: RE: Help
>
> Another thing:
>
> When query log is on.
>
> Traffic is 35k QPS, the Named CPU usage is 260%
> Traffic is 40K QPS, the Named CPU usage is 260% Traffic is 50K QPS,
> the Named CPU usage is 260% Traffic is 70 -100 KQPS, the named CPU
> usage is still 260%
>
> When the named CPU usage has a limitation 260% here ? (in theory, it
> should be 400%)
>
> BR
> Michael
>
> -Original Message-
> From: Tony Finch [mailto:d...@dotat.at]
> Sent: Wednesday, February 21, 2018 11:09 AM
> To: PENG, JUNAN
> Cc: bind-users@lists.isc.org
> Subject: Re: Help
>
> PENG, JUNAN wrote:
> >
> > Why Query log off/on feature is impacting named CPU Usage ?
>
> It has to serialize query processing in order to write to the log,
> and that serialization barrier limits the parallelism that it can
> achieve (due to Amdahl's law).
>
> Tony.
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