From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 98B3F244667 for ; Thu, 18 Jun 2026 19:38:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781811507; cv=none; b=jmO0Uyz1n0s+AC8isecYU+6l+COwAnTW+vsyl08ylxsgu2v2oH4HT7nQL8AS6cCSO1vjsjxpkI/Di1xAZPiCPPfAjb1XSqVkJHruy6FlKTRP14V4EhjPereSZ4nVJmulP69kqU1pqwGKxAv+hqPKFR9TCukBaapAFOhkhfzkvTw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781811507; c=relaxed/simple; bh=AXB+vd7q3QFtApjuwjNJ1C9pK/9ayqpcEsMsyT2bzVo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: In-Reply-To:Content-Type:Content-Disposition; b=rv54lpgWE7pTvnl3dZH//19FzSagRz1atAg+frTCMKDwD0c9djVJP5gWZmcvxICF6dqByXXwjpL5Vh/XUsIFR6kaVj0dWwuNmzZnudnER4pUh1xkxIxcqmAG7S9EAaz9tUqQkBq9y9jvH988rZ1ElLpBBtfDv+NL1gpAzoRZqno= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=CeMw1+mA; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="CeMw1+mA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1781811504; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=v4tU6EXgAyv7y3kQU85iL044CFSI/k5F6+KrX2jO5uU=; b=CeMw1+mAByvd1sWDzz+UBXl1wiQ4bGWdLifLQIuy0swYfjbNZ0UI+XNa3zaD6BhCS67Yeh pwv5Tf8yZPJBgvd6jd08kMlJ3sI39t2rh4subjW/j0mCvBvfoF8d0FjvgMOQNdXWzU7Bk3 jyJATWS8tLgheG040TgKNi0z2aVPOtw= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-232-dkm0OffCPG6yuv3lxSR4Mw-1; Thu, 18 Jun 2026 15:38:21 -0400 X-MC-Unique: dkm0OffCPG6yuv3lxSR4Mw-1 X-Mimecast-MFC-AGG-ID: dkm0OffCPG6yuv3lxSR4Mw_1781811500 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E60691955F78; Thu, 18 Jun 2026 19:38:19 +0000 (UTC) Received: from bmarzins-01.fast.eng.rdu2.dc.redhat.com (bmarzins-01.fast.eng.rdu2.dc.redhat.com [10.6.23.12]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 656E5195608D; Thu, 18 Jun 2026 19:38:19 +0000 (UTC) Received: from bmarzins-01.fast.eng.rdu2.dc.redhat.com (localhost [127.0.0.1]) by bmarzins-01.fast.eng.rdu2.dc.redhat.com (8.18.1/8.17.1) with ESMTPS id 65IJcIrB910228 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Thu, 18 Jun 2026 15:38:18 -0400 Received: (from bmarzins@localhost) by bmarzins-01.fast.eng.rdu2.dc.redhat.com (8.18.1/8.18.1/Submit) id 65IJcGSn910227; Thu, 18 Jun 2026 15:38:16 -0400 Date: Thu, 18 Jun 2026 15:38:16 -0400 From: Benjamin Marzinski To: Xose Vazquez Perez Cc: Martin Wilck , Christophe Varoqui , DM_DEVEL-ML Subject: Re: [PATCH v3 5/8] multipath-tools: clarify path selector descriptions in multipath.conf.5 Message-ID: References: <20260618134521.16878-1-xose.vazquez@gmail.com> Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20260618134521.16878-1-xose.vazquez@gmail.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: KPzwxF7bf17XOPJrTfkdBSjm0V2YcG5hspX4mnaoe_s_1781811500 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Jun 18, 2026 at 03:45:20PM +0200, Xose Vazquez Perez wrote: > Selectors operate on the next individual I/O request rather > than a "bunch" of I/O. > > Suggested-by: Benjamin Marzinski > Cc: Martin Wilck > Cc: Benjamin Marzinski > Cc: Christophe Varoqui > Cc: DM_DEVEL-ML > Signed-off-by: Xose Vazquez Perez > --- > v2: fix typo, s/group/groups (spotted by Martin) > v3: revert v2, "group" makes more sense. (spotted by Ben) Reviewed-by: Benjamin Marzinski > > multipath/multipath.conf.5.in | 12 +++++------- > 1 file changed, 5 insertions(+), 7 deletions(-) > > diff --git a/multipath/multipath.conf.5.in b/multipath/multipath.conf.5.in > index 422ab120..5b730801 100644 > --- a/multipath/multipath.conf.5.in > +++ b/multipath/multipath.conf.5.in > @@ -2,7 +2,7 @@ > .\" Update the date below if you make any significant change. > .\" ---------------------------------------------------------------------------- > . > -.TH MULTIPATH.CONF 5 2026-05-27 Linux > +.TH MULTIPATH.CONF 5 2026-06-13 Linux > . > . > .\" ---------------------------------------------------------------------------- > @@ -193,20 +193,18 @@ kernel multipath target: > .RS > .TP > .I "round-robin 0" > -Choose the path for the next bunch of I/O by looping through every path in the > -path group, sending \fBthe same number of I/O requests\fR to each path. > - > +Choose the path for the next I/O request by \fBcycling through the path group\fR. > .TP > .I "queue-length 0" > -(Since 2.6.31 kernel) Choose the path for the next bunch of I/O based on \fBthe lowest > +(Since 2.6.31 kernel) Choose the path for the next I/O request based on \fBthe lowest > number of outstanding in-flight I/O requests\fR to the path. > .TP > .I "service-time 0" > -(Since 2.6.31 kernel) Choose the path for the next bunch of I/O based on \fBthe > +(Since 2.6.31 kernel) Choose the path for the next I/O request based on \fBthe > lowest total size (in bytes) of outstanding in-flight I/O requests\fR to the path. > .TP > .I "historical-service-time 0" > -(Since 5.8 kernel) Choose the path for the next bunch of I/O with \fBa dynamic > +(Since 5.8 kernel) Choose the path for the next I/O request with \fBa dynamic > algorithm based on the historical service time and the number of outstanding > in-flight I/O requests\fR to the path. > .TP > -- > 2.54.0