Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1245886

Re: Updated scalable urandom patchkit

Show all headers | View raw

I tested the two proposed patches from earlier this thread on a 4S
system. This was just with my (worst case) micro.

Unfortunately both patches scale much worse than the duplicated pools,
and can be even worse than the baseline (not sure why).

The base line peaks at slightly above 200K ops/s with less than 20 CPUs.
And the it gets slower until settling around 100K ops/s with more CPUs.

Ted's patch peaks at 350K with four CPUs, but then quickly degrades to
50K ops/s at 20+ CPUs. At 144 CPUs it is slightly faster again at ~80K.

Spelvin's patch peaks at only 140K at 2 CPUs (so it's slower than base line),
stays around 120K upto 20, then degrades quickly to 50K and then slowly
improves again to ~80K.

The duplicated pool patch is ~200K upto 20 CPus, 400K upto 40, 600K at
slightly below 60 CPUs, and then very slowly degrades to 520K at 144. 

-Andi


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-10 21:00 +0200
  Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-11 04:40 +0200
    Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-11 05:00 +0200
    Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-11 06:40 +0200
      Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-12 00:30 +0200
        Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-12 02:20 +0200
          Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-12 06:10 +0200
            Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-12 09:50 +0200
              Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-12 16:00 +0200
                Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-12 22:40 +0200
                Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-12 22:40 +0200
                Re: Updated scalable urandom patchkit Theodore Ts'o <tytso@mit.edu> - 2015-10-13 04:50 +0200
                Re: Updated scalable urandom patchkit Raymond Jennings <shentino@gmail.com> - 2015-10-13 06:30 +0200
                Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-13 10:00 +0200
                Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-13 08:30 +0200
                Re: Updated scalable urandom patchkit Andi Kleen <andi@firstfloor.org> - 2015-10-13 18:30 +0200
                Re: Updated scalable urandom patchkit "George Spelvin" <linux@horizon.com> - 2015-10-13 23:20 +0200
                Re: Updated scalable urandom patchkit Andi Kleen <andi@firstfloor.org> - 2015-10-14 04:20 +0200
                [RFC PATCH 0/4] Alternate sclable urandom patchset "George Spelvin" <linux@horizon.com> - 2015-10-16 07:30 +0200
                [RFC PATCH 2/4] random: Remove two unused arguments from extract_entropy() "George Spelvin" <linux@horizon.com> - 2015-10-16 07:40 +0200
                [RFC PATCH 4/4] random: Make non-blocking mixback non-blocking "George Spelvin" <linux@horizon.com> - 2015-10-16 07:40 +0200
                [RFC PATCH 3/4] random: Only do mixback once per read "George Spelvin" <linux@horizon.com> - 2015-10-16 07:40 +0200
                Re: [RFC PATCH 3/4] random: Only do mixback once per read kbuild test robot <lkp@intel.com> - 2015-10-16 08:20 +0200
                Re: [RFC PATCH 3/4] random: Only do mixback once per read "George Spelvin" <linux@horizon.com> - 2015-10-16 10:20 +0200

csiph-web