From: Sedat Dilek <sedat.dilek@gmail.com>
To: Willy Tarreau <w@1wt.eu>
Cc: George Spelvin <lkml@sdf.org>, Amit Klein <aksecurity@gmail.com>,
Eric Dumazet <edumazet@google.com>,
"Jason A. Donenfeld" <Jason@zx2c4.com>,
Andy Lutomirski <luto@kernel.org>,
Kees Cook <keescook@chromium.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
netdev@vger.kernel.org
Subject: Re: [DRAFT PATCH] random32: make prandom_u32() output unpredictable
Date: Fri, 14 Aug 2020 18:17:56 +0200 [thread overview]
Message-ID: <CA+icZUUVv9DYJHr79FnDcd57QCtXKmzEkt1cYvQ1DT8j1G19Ng@mail.gmail.com> (raw)
In-Reply-To: <20200814160551.GA11657@1wt.eu>
On Fri, Aug 14, 2020 at 6:05 PM Willy Tarreau <w@1wt.eu> wrote:
>
> On Fri, Aug 14, 2020 at 05:32:32PM +0200, Sedat Dilek wrote:
> > commit 94c7eb54c4b8e81618ec79f414fe1ca5767f9720
> > "random32: add a tracepoint for prandom_u32()"
> >
> > ...I gave Willy's patches a try and used the Linux Test Project (LTP)
> > for testing.
>
> Just FWIW today I could run several relevant tests with a 40 Gbps NIC
> at high connection rates and under SYN flood to stress SYN cookies.
> I couldn't post earlier due to a net outage but will post the results
> here. In short, what I'm seeing is very good. The only thing is that
> the noise collection as-is with the 4 longs takes a bit too much CPU
> (0.2% measured) but if keeping only one word we're back to tausworthe
> performance, while using siphash all along.
>
> The noise generation function is so small that we're wasting cycles
> calling it and renaming registers. I'll run one more test by inlining
> it and exporting the noise.
>
> So provided quite some cleanup now, I really think we're about to
> reach a solution which will satisfy everyone. More on this after I
> extract the results.
>
Great news!
Will you publish your new version in [1]?
- Sedat -
[1] https://git.kernel.org/pub/scm/linux/kernel/git/wtarreau/cleanups.git/
next prev parent reply other threads:[~2020-08-14 16:18 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CA+icZUVnsmf1kXPYFYufStQ_MxnLuxL+EWfDS2wQy1VbAEMwkA@mail.gmail.com>
2020-08-09 21:10 ` [DRAFT PATCH] random32: make prandom_u32() output unpredictable Sedat Dilek
[not found] ` <20200809235412.GD25124@SDF.ORG>
[not found] ` <20200810034948.GB8262@1wt.eu>
[not found] ` <20200811053455.GH25124@SDF.ORG>
[not found] ` <20200811054328.GD9456@1wt.eu>
[not found] ` <20200811062814.GI25124@SDF.ORG>
[not found] ` <20200811074538.GA9523@1wt.eu>
2020-08-11 10:51 ` Sedat Dilek
2020-08-11 11:01 ` Sedat Dilek
2020-08-12 3:21 ` Willy Tarreau
2020-08-13 7:53 ` Sedat Dilek
2020-08-13 8:06 ` Willy Tarreau
2020-08-13 8:13 ` Sedat Dilek
2020-08-13 8:27 ` Sedat Dilek
2020-08-13 14:00 ` Eric Dumazet
2020-08-13 16:02 ` Sedat Dilek
2020-08-14 15:32 ` Sedat Dilek
2020-08-14 16:05 ` Willy Tarreau
2020-08-14 16:17 ` Sedat Dilek [this message]
2020-08-16 15:01 ` Willy Tarreau
2020-08-16 16:48 ` Sedat Dilek
2020-08-20 3:05 ` Sedat Dilek
2020-08-20 4:33 ` Willy Tarreau
2020-08-20 4:42 ` Sedat Dilek
2020-08-20 6:08 ` Willy Tarreau
2020-08-20 6:58 ` Willy Tarreau
2020-08-20 8:05 ` Willy Tarreau
2020-08-20 12:08 ` Sedat Dilek
[not found] ` <CANEQ_+L+22Hkdqf38Zr0bfq16fcL1Ax2X9fToXV_niHKXCB8aA@mail.gmail.com>
2020-08-27 1:09 ` Willy Tarreau
2020-08-27 7:08 ` Sedat Dilek
2020-08-08 15:26 Flaw in "random32: update the net random state on interrupt and activity" George Spelvin
2020-08-09 6:57 ` [DRAFT PATCH] random32: make prandom_u32() output unpredictable George Spelvin
2020-08-09 9:38 ` Willy Tarreau
2020-08-09 17:06 ` George Spelvin
2020-08-09 17:33 ` Willy Tarreau
2020-08-09 18:30 ` George Spelvin
2020-08-09 19:16 ` Willy Tarreau
2020-08-10 11:47 ` Willy Tarreau
2020-08-10 12:01 ` David Laight
2020-08-10 14:48 ` Willy Tarreau
2020-08-10 12:03 ` Florian Westphal
2020-08-10 14:53 ` Willy Tarreau
2020-08-10 16:31 ` Linus Torvalds
2020-08-10 16:58 ` Willy Tarreau
2020-08-10 17:45 ` Linus Torvalds
2020-08-10 18:01 ` Willy Tarreau
2020-08-10 21:04 ` Willy Tarreau
2020-08-11 5:26 ` George Spelvin
2020-08-11 5:37 ` Willy Tarreau
2020-08-11 3:47 ` George Spelvin
2020-08-11 3:58 ` Willy Tarreau
[not found] ` <fdbc7d7d-cba2-ef94-9bde-b3ccae0cfaac@gmail.com>
2020-08-09 21:10 ` Marc Plumb
2020-08-09 21:48 ` Linus Torvalds
2020-08-09 13:50 ` Randy Dunlap
[not found] ` <CANEQ_++a4YcwQQ2XhuguTono9=RxbSRVsMw08zLWBWJ_wxG2AQ@mail.gmail.com>
2020-08-09 16:08 ` George Spelvin
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