Oliver Herold wrote:
Hi,
I saw this bind benchmarks just some minutes ago,
http://new.isc.org/proj/dnsperf/OStest.html
is this true for FreeBSD 7 (current state: RELENG_7/7.0R) too? Or is
this something verified only for the state of development back in August
2007?
I have been trying to replicate this. ISC have kindly given me access
to their test data but I am seeing Linux performing much slower than
FreeBSD with the same ISC workload.
http://people.freebsd.org/~kris/scaling/bind-pt.png
Summary:
* FreeBSD 7.0-R with 4BSD scheduler has close to ideal scaling on this test.
* The drop above 6 threads is due to limitations within BIND.
* Linux 2.6.24 has about 35% lower performance than FreeBSD, which is
significantly at variance with the ISC results. It also doesn't scale
above 3 CPUs.
* I am trying to understand what is different about the ISC
configuration but have not yet found the cause. They were testing
2.6.20.7 so it is possible that there was a major regression before the
2.6.22 and .24 kernels I tested. Or maybe something is broken with the
Intel gige driver in Linux (they were using broadcom hardware). The
graph is showing performance over 10ge, but I get the same peak
performance over gige when I query from 2 clients (the client benchmark
is very sensitive to network latency so a single client is not enough to
saturate BIND over gige).
* 7.0 with ULE has a bug on this workload (actually to do with workloads
involving high interrupt rates). It is fixed in 8.0.
* Changes we have in progress to improve UDP performance do not help
much with this particular workload (only about 5%), but with more
scalable applications we see 30-40% improvement. e.g. NSD
(ports/dns/nsd) is a much faster and more scalable DNS server than BIND
(because it is better optimized for the smaller set of features it
supports).
Kris
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