From owner-freebsd-stable@freebsd.org Tue May 21 14:54:25 2019 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1C71F15AF94A for ; Tue, 21 May 2019 14:54:25 +0000 (UTC) (envelope-from josiaslg@bsd.com.br) Received: from mail-pf1-x441.google.com (mail-pf1-x441.google.com [IPv6:2607:f8b0:4864:20::441]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A777E69A5B for ; Tue, 21 May 2019 14:54:22 +0000 (UTC) (envelope-from josiaslg@bsd.com.br) Received: by mail-pf1-x441.google.com with SMTP id 13so9197984pfw.9 for ; Tue, 21 May 2019 07:54:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsd.com.br; s=capeta; h=mime-version:from:date:message-id:subject:to; bh=hcIKJr9oRRlFiDlfYfeoZ9xPBnQLD44JDmTrOZWJR2I=; b=IJ+qlJglOGSUuu0454C9l0injMgwU64d2t7VahLWU7NUbqW+xjt4CoypS69zuvb7I5 wsMnEDR2sfdTXhqmliGyIZc3Vyuyu6gbH1gvKXcSIhkDDSCWauh0wcVR9QbrL2S7ojY4 uQZHsVKvWg2q2RL0hPICLVHEzphkfV+AsM8fU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=hcIKJr9oRRlFiDlfYfeoZ9xPBnQLD44JDmTrOZWJR2I=; b=F3icZh+mWoVZKviiXyyeqP1jd1zMp0X+pLUAPuk3JilhUuQpLFHE2E5TcubrZIPurZ 2dtHQt99x/OFW0khC3zTh+7CP+zx3Ut78xlrcBMdOeHQ3sgzH3Aq+K01ZuBxiv6PEyGF fp+6iRtBSO5hJR/w/VP++iVZDu+h1fGCVNOmlT+2V5jSEq/wHDaLL9UOW95Ww6k0ACfg Sa+wC34lZkHK4ID2qTb3e4ELW31THI1pSO+8y1HBpTM+mgX1DTJhRaBEIA56lz4WL8EY RtNnKr4WlVQnMV7u4smeyV/eYwgDvW+6/d226plriLUVYqFMC9cINui5Kx/0S0SEyOpK HkYA== X-Gm-Message-State: APjAAAVC3+nrNr/PBvb2ODopCTcej4Z4bppQaA3uM7SpGTh3GVoJgY6c oAssIv1xKqj1fRRwI5x07iBFzxE245IH1HgU6nxlMprLVdnLCg== X-Google-Smtp-Source: APXvYqxx0rXQOlcJVuyJQhZ8L8jx3jURHgHzizVS+fVaL2s2jCY0Uw+yTAUIMpmo4dRCSuwDi+4b6K0swpWWZpQwGvk= X-Received: by 2002:aa7:910e:: with SMTP id 14mr58585594pfh.153.1558450460846; Tue, 21 May 2019 07:54:20 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?Q?Josias_L=2E_Gon=C3=A7alves?= Date: Tue, 21 May 2019 11:54:09 -0300 Message-ID: Subject: mdconfig and the [no]async option To: freebsd-stable@freebsd.org X-Rspamd-Queue-Id: A777E69A5B X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=bsd.com.br header.s=capeta header.b=IJ+qlJgl; spf=pass (mx1.freebsd.org: domain of josiaslg@bsd.com.br designates 2607:f8b0:4864:20::441 as permitted sender) smtp.mailfrom=josiaslg@bsd.com.br X-Spamd-Result: default: False [-4.37 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[bsd.com.br:s=capeta]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-stable@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; DMARC_NA(0.00)[bsd.com.br]; DKIM_TRACE(0.00)[bsd.com.br:+]; MX_GOOD(-0.01)[ASPMX.L.GOOGLE.COM,ALT2.ASPMX.L.GOOGLE.COM,ASPMX5.GOOGLEMAIL.COM,ALT1.ASPMX.L.GOOGLE.COM,ASPMX3.GOOGLEMAIL.COM,ASPMX2.GOOGLEMAIL.COM,ASPMX4.GOOGLEMAIL.COM]; RCVD_IN_DNSWL_NONE(0.00)[1.4.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_SHORT(-0.94)[-0.936,0]; IP_SCORE(-0.92)[ip: (0.98), ipnet: 2607:f8b0::/32(-3.26), asn: 15169(-2.27), country: US(-0.06)]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; RCVD_COUNT_TWO(0.00)[2] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.29 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 May 2019 14:54:25 -0000 Hi. I'm testing md devices with zfs and i see a slow performance on md0 and md1 (md1 by network). Reading in man, i have the noasync option to up performance but the warning: For vnode backed devices: avoid IO_SYNC for increased performance but at the risk of deadlocking the entire kernel. So, can the operating system freeze if some write or read block fail ?. Best Regards.