From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-x22a.google.com (mail-lf0-x22a.google.com [IPv6:2a00:1450:4010:c07::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 01F9A3CB35 for ; Mon, 5 Jun 2017 16:26:25 -0400 (EDT) Received: by mail-lf0-x22a.google.com with SMTP id p189so10617713lfe.2 for ; Mon, 05 Jun 2017 13:26:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc; bh=tLL8NQ894Ad/kpmFpvHial3jKQyZ5BxdJQ55rXN4iKc=; b=n/Z6AwitWYpYq1M+r7CaKsVVN4XRxFHj0UlE0uXVEdj5WI1nXt6qnU/c9eLpm5Mxda OKL7NP9HiGIyPBm0nF6o5Cg7tgNg1XBcyajgrEUfRt2CE7M1ZKQaYSekj/Vldebf+QuS g5P2bizfxHLnTI2Nh2tXQWPOd2ICrmHNstAVBOXSOeg4TyqLeY+GcL+VAvlN0v3JR2b8 aPXpgVOfNhV79dDVlv/ZP0CNAcgk5y23h4OurJBmoewcxZM2NDOcaw7LfSohjOUfhu7d OoAU/8OQsZVMTCk3NOhApcwgpRzO/yCC5uaqrXFUYyIhhuGjjbzA/zHjQfo5nInBgfYh OAqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:sender:in-reply-to:references:from :date:message-id:subject:to:cc; bh=tLL8NQ894Ad/kpmFpvHial3jKQyZ5BxdJQ55rXN4iKc=; b=GFurUiNeGK2SUatj6DQFLMDKQBHN35gf5epwWr8fd7bv8dx5+SvJthQrAtZC+lBs64 l2bfZfgqvlc6DpYdwPrE0/rc5SC7FCvUP/KGo2G7bMKOiOUvusGpBfLLI2LUKDd2t5cl 9Dg3CxmPChXo2vCCHjoTydAAiNFIug+PnX4udEgTtPEQwFVupo5xtXSH91KoCqD8omwb INcjbWzCWy+zp5xZWCXyulvkpe5iqCfiMrf+5hURuNRgwNdm+KUWQqdV2qZVsMllpQ1g BxkV8YMEowaHozQFEFqBcq1K8jDjn/7hgIrf35jGLdN6EX4Ipaeb1D79R7UY3J/E+Tj9 NqQA== X-Gm-Message-State: AODbwcCxgofGGMYVOvYNALG+mLytHZR/GVEPhZ7prLphy07UQAilNcZR LAKNCmg8I6D+OFPT7Anp7NcO6sk1eQ== X-Received: by 10.25.99.201 with SMTP id v70mr3727655lfi.63.1496694384870; Mon, 05 Jun 2017 13:26:24 -0700 (PDT) MIME-Version: 1.0 Sender: gettysjim@gmail.com Received: by 10.25.207.137 with HTTP; Mon, 5 Jun 2017 13:26:23 -0700 (PDT) In-Reply-To: References: <2d60e776-2a4f-de66-0d2f-a36568562f96@gmail.com> From: Jim Gettys Date: Mon, 5 Jun 2017 16:26:23 -0400 X-Google-Sender-Auth: X47AW45aGUmTae9HGZKHZD1LaJo Message-ID: To: David Lang Cc: Richard Smith , "cerowrt-devel@lists.bufferbloat.net" Content-Type: multipart/alternative; boundary="94eb2c0c8c0425cc8705513c5149" Subject: Re: [Cerowrt-devel] solar wifi ap designs? X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Jun 2017 20:26:26 -0000 --94eb2c0c8c0425cc8705513c5149 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Jun 5, 2017 at 4:20 PM, David Lang wrote: > On Mon, 5 Jun 2017, Richard Smith wrote: > > My WNDR 3700v2 power supply is rated at 12V 2.5A which is a peak of 30W. >> > > don't forget that this includes providing power out to the USB port as > well. > > yet another reason to measure things :-) =E2=80=8BUSB places (placed?) multiple second =E2=80=8Blatencies on suspend= /resume as well. This makes it really hard to do decent high speed power management on an operating system. Linux itself we measured on an iPAQ at 20ms latency to suspend resume. Then when you had a USB port, it took of order a second (to get the best power management on OLPC we had to disable USB entirely). Have I said how much I hate USB? - Jim > > David Lang > k > > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel > --94eb2c0c8c0425cc8705513c5149 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

On Mon, Ju= n 5, 2017 at 4:20 PM, David Lang <david@lang.hm> wrote:
On Mon, 5 Jun 2017, Richard Smit= h wrote:

My WNDR 3700v2 power supply is rated at 12V 2.5A which is a peak of 30W.

don't forget that this includes providing power out to the USB port as = well.

yet another reason to measure things :-)

=E2=80=8BUSB places (placed= ?) multiple second =E2=80=8Blatencies on suspend/resume as well.

This makes it really hard to do dec= ent high speed power management on an operating system.=C2=A0 Linux itself = we measured on an iPAQ at 20ms latency to suspend resume.=C2=A0 Then when y= ou had a USB port, it took of order a second (to get the best power managem= ent on OLPC we had to disable USB entirely).

Have I said how much I hate USB?
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0- Jim



David Lang
k

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