From owner-freebsd-hackers@freebsd.org Tue Feb 2 13:01:20 2016 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7C811A970FE for ; Tue, 2 Feb 2016 13:01:20 +0000 (UTC) (envelope-from dewaynegeraghty@gmail.com) 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)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 07E831897 for ; Tue, 2 Feb 2016 13:01:20 +0000 (UTC) (envelope-from dewaynegeraghty@gmail.com) Received: by mail-lf0-x22a.google.com with SMTP id j78so47934415lfb.1 for ; Tue, 02 Feb 2016 05:01:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:from:date:message-id:subject:to:content-type; bh=IAUA+g9x6sFv6c7CJx+vD3opl0d/HQlrxRJaVXxvR1Y=; b=DNhLAjxi+85ywkJMYlVNewZZZNWaw/0ZlR0ROmTIffMgOmhD3IM4sMX61lXbtVbXKd RFMwNoRIH0VYVL2psKQL270fVev/O4MbXXhCIERMTXw+8NGyJMtl9O0nD0uLsl9nIQGh nEvMdRhKfOj0FmFqhUOb/OEJp2X6n3FXd1VSHAOlI28Xw3dXMYexjlE55kBhdZCL4Upi X+/MNqMyjJ2jaqSFxYHgYuPMp1w3ad2Pmz/kQ1JUKR2RO2mEc50NA3zGpWDvdBkjjonK eXQwkVDFEjJTOIqwvSPrLnV7PohAN1tA2pGWX2dFXcGD+fDS1+U80XYJI5GJB+pUfqCy wAyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to :content-type; bh=IAUA+g9x6sFv6c7CJx+vD3opl0d/HQlrxRJaVXxvR1Y=; b=L68WMIogmkurjRB2yQDLRF+fqYf3BEvZt7fLEK4GTC/uFwqvR06s5drLlW3ueGLuCs MYGUTAf2vAHPpJvAaS/mTQlC0fvhPDCSfq4X3S4xPD6IfdLTs/9Jj5rf5VfK5/67lau/ mlTO7WHw1n4p3Ls7JR2gbl/DPjUk7B4scLw3GtLrSA6uCzuK55XKgyvUltnFw293SuvC /XwwuGgY4BmcAXX+XUYAQ7rC3J1F9kOfPartivkMz0PDbzgtjCH45j6/gwC2jU/W/YXf VPzMGW/6Uo5/pOFtJGKg91IzVli/9WlP6Stbi3bkYJW1QJjoaHs275wRsROhvlrZ/i+q s0og== X-Gm-Message-State: AG10YORwPHNh1Jeh3FuwUjadp/01AejTCDq5UV9b/oqB6JZnl6kwhsz10vuPQGD3r988dcV2gfWTP0PXKNyX7g== X-Received: by 10.25.170.129 with SMTP id t123mr11094945lfe.103.1454418078142; Tue, 02 Feb 2016 05:01:18 -0800 (PST) MIME-Version: 1.0 Received: by 10.25.155.145 with HTTP; Tue, 2 Feb 2016 05:00:48 -0800 (PST) From: Dewayne Geraghty Date: Wed, 3 Feb 2016 00:00:48 +1100 Message-ID: Subject: Priority settings for gmirror,cam,geom are at the right priority -8? To: freebsd-hackers@freebsd.org X-Mailman-Approved-At: Tue, 02 Feb 2016 13:49:15 +0000 Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.20 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Feb 2016 13:01:20 -0000 While waiting for a bunch of build jails to be cleaned, I glanced at top -PjSuz -mio -o ivcsw and noticed that g_mirror, geom,cam and rm were experiencing involuntary context swaps. I could understand rm, but not the system daemons. All of these had a priority of -8. I'm wondering if the system daemons should be set at a higher priority, or should I expect a speedier rm if I niced it? The system almost idle, load averages being { 0.15, 0.48, 0.87 } PID JID UID VCSW IVCSW READ WRITE FAULT TOTAL PERCENT COMMAND 7 0 0 3594 15 0 0 0 0 0.00% g_mirror gm0 13 0 0 3512 12 0 0 0 0 0.00% geom 37223 0 0 1528 7 1523 3 0 1526 90.67% rm 4 0 0 1938 5 0 0 0 0 0.00% cam 12 0 0 2018 1 0 0 0 0 0.00% intr This is on a xeon 8 core with SSD's whose sole purpose is to build FreeBSD stable and packages that we require. The scheduler is 4BSD and kern.sched.slice=64. As such I'm stumped as to why "intr" would run out of its quantum (and its running at priority -72)? My apologies for any apparent ignorance, I'm a physicist by training and security manager via necessity. :) Kind regards, Dewayne