From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <goldstein.w.n@gmail.com>
Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com
 [IPv6:2607:f8b0:4864:20::633])
 by sourceware.org (Postfix) with ESMTPS id 6CFF53858010
 for <libc-alpha@sourceware.org>; Thu, 31 Mar 2022 18:16:53 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 6CFF53858010
Received: by mail-pl1-x633.google.com with SMTP id i11so293375plg.12
 for <libc-alpha@sourceware.org>; Thu, 31 Mar 2022 11:16:53 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20210112;
 h=x-gm-message-state:mime-version:references:in-reply-to:from:date
 :message-id:subject:to:cc;
 bh=WaftjTYckU9Nul//kH36rlJaTU1EC/ue3dmxPM13j1U=;
 b=WAkfkYPej6WNNu4oP4ibESn3+2sFlSQ2TpmkPZR71qfhyX5W5pwP6jKb+/Sq+5rn80
 A2URbwiqvDzb9/lLq98kwHXcBXuVmgvm3TNL4CjEDCAyUFJWoUDRHoVV2/Q4yrSz5HfL
 agEyWef6lP5SyZejohXDq9bxdr+chLRELkSfh/zatbHlPllutlkGVKn7+xcLH1dVZBm8
 QJmTmvH5SrcBBiny0Jaq6afnWAD/b7v4w+00fWA3gvpwHIUprojyskG/b7jJSzXCahIK
 g4foi0nLhqw6k8oZv/NeYyBorFW0baJNYbGAay250F2DRPqPErP0ZtgJejYie7aHL2iA
 +Y7w==
X-Gm-Message-State: AOAM533MYS51LkMGjhsKFRoJJTClSuaA5n+XMuJCsSvrWuqHtOge0F95
 ld9pvDfNbSeQ+yu6X7qlbDeZuaW4yQ2kvV4vMuCCbZfb
X-Google-Smtp-Source: ABdhPJxumOynFf30TtvJLqNMi2IdOaokwvTNo3JpBiLS2pwReL++SLlzD1AFGu/k6KWhbUHq7mS0M4PYXTiHM/A/l8A=
X-Received: by 2002:a17:90b:4c09:b0:1c7:6c8:43c8 with SMTP id
 na9-20020a17090b4c0900b001c706c843c8mr7426531pjb.208.1648750612512; Thu, 31
 Mar 2022 11:16:52 -0700 (PDT)
MIME-Version: 1.0
References: <20220328220936.2724834-1-goldstein.w.n@gmail.com>
 <c6837918-aa51-4e71-bbc8-74e522f1c0c9@linaro.org>
 <CAFUsyfJhWVw81=_5JJWU4t6NYwtpOQ4Fj+H2pFaV3GTiT9yBYw@mail.gmail.com>
 <7b48ece6-392a-0850-c136-01ab751273ef@linaro.org>
 <CAFUsyfLmPZmrKYdaKJXdd8i_piZXy2Uwij-qpAgibeHtZr_ssQ@mail.gmail.com>
 <72332228-093c-5186-789f-8616cfb93793@linaro.org>
 <CAFUsyfKiE1c0uoYCd7ktJnhmt0P0XcrmtM59zSsL-puE_AZafw@mail.gmail.com>
 <CAPBLoAccdvhGbTkxZCfzVbHrVrQT78jmxpErLW=i2qvLXABucg@mail.gmail.com>
 <CAHmME9q8XLzmPjYJV0yK6TK7BQbNEcoeEp0_9yW-+FxaUm+OcA@mail.gmail.com>
 <CAPBLoAec_OCGDsC8-69L60=r-xRVvZEsMZmALj4HO6ZcpmC4=g@mail.gmail.com>
 <0198ce75-8a8e-4355-eed1-f69dfb6f40f0@linaro.org>
 <CAHmME9pQTd-xKN19j0HXqVhuzg+gbnEYGb3E2SmXaZFgjiz9yA@mail.gmail.com>
In-Reply-To: <CAHmME9pQTd-xKN19j0HXqVhuzg+gbnEYGb3E2SmXaZFgjiz9yA@mail.gmail.com>
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Thu, 31 Mar 2022 13:16:41 -0500
Message-ID: <CAFUsyfLHfkT5=JOzQtV7sh38otHuGVXJAXfP_ZrqhET=VDxuWw@mail.gmail.com>
Subject: Re: [PATCH v1 1/2] random-bits: Factor out entropy generating function
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Adhemerval Zanella <adhemerval.zanella@linaro.org>, 
 =?UTF-8?Q?Cristian_Rodr=C3=ADguez?= <crrodriguez@opensuse.org>, 
 GNU C Library <libc-alpha@sourceware.org>, Florian Weimer <fweimer@redhat.com>
Content-Type: text/plain; charset="UTF-8"
X-Spam-Status: No, score=-3.5 required=5.0 tests=BAYES_00, DKIM_SIGNED,
 DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,
 SPF_HELO_NONE, SPF_PASS, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: libc-alpha@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Libc-alpha mailing list <libc-alpha.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/libc-alpha/>
List-Post: <mailto:libc-alpha@sourceware.org>
List-Help: <mailto:libc-alpha-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/libc-alpha>,
 <mailto:libc-alpha-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Thu, 31 Mar 2022 18:16:56 -0000

On Thu, Mar 31, 2022 at 10:32 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> Just so we're on the same page here, is this a discussion about
> optimizing https://code.woboq.org/userspace/glibc/include/random-bits.h.html
> ?
>
> You just need a super fast random uint32_t for some future pthread changes?

On architectures with some fast non-syscall timer like x86 (`rdtsc`)
will this ever
be worth it?

>
> If so, I can send a patch to return moderately secure integers here really fast.
>
> Jason