From owner-svn-src-all@freebsd.org Fri Jan 18 00:49:12 2019 Return-Path: Delivered-To: svn-src-all@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 6C6A91486EB4; Fri, 18 Jan 2019 00:49:12 +0000 (UTC) (envelope-from cse.cem@gmail.com) Received: from mail-it1-f176.google.com (mail-it1-f176.google.com [209.85.166.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 073E98E896; Fri, 18 Jan 2019 00:49:11 +0000 (UTC) (envelope-from cse.cem@gmail.com) Received: by mail-it1-f176.google.com with SMTP id g85so4454767ita.3; Thu, 17 Jan 2019 16:49:11 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:reply-to :from:date:message-id:subject:to:cc; bh=4BR2P7GqZ2ZwmMeqZvweeD6syBbdydmbE0YX2Zch3Yc=; b=RDUnkBF2nMtSw7VpqB0IH0uTxL6Uy9f+DE6KC893G7UM30gv4MGZkXRLvWbXoQoTkB ntqJ8lV4b4fqQdfbwyx6HYIsG9nvh2LFbNqtLtbAkCoI1JXzGfB3HAGNOSJgGS45TrAF rtQ0IEROtGa4Chu9igfj2IDdCh9WeYU7UdASP8wSq5SAzV3wJ/WqPTnsrSRcBqgIwdco Jwg9umfcxftH/vX7nsNeKADngsXTTvTKIBXTzG5H6izo2xA5M02db0UrzbaNC2NlMiFc LGEUsFLxgl+DgilNMciJEOyQOEZ4wP2o6b7cpexSaf3i/hHYXdP8pcsO/FTqDt/Bdw9j TdwQ== X-Gm-Message-State: AJcUukdjmpxfwrarTLmgzfnk+LsN/knISMH0XQHfi0nFjxa95oP7Zzqw giisoiwtwmBqFX0nYxbFeYVtpM5I X-Google-Smtp-Source: ALg8bN4xcxDGgSPZBJyjvkcmKHfl98KJkW5ZCoi0pOzgpY19tldKGIKntmAjf93Y2jYuqGIANJPJYQ== X-Received: by 2002:a02:781e:: with SMTP id p30mr9899245jac.85.1547772209229; Thu, 17 Jan 2019 16:43:29 -0800 (PST) Received: from mail-io1-f42.google.com (mail-io1-f42.google.com. [209.85.166.42]) by smtp.gmail.com with ESMTPSA id v3sm1189205ioj.79.2019.01.17.16.43.28 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 17 Jan 2019 16:43:28 -0800 (PST) Received: by mail-io1-f42.google.com with SMTP id k7so9404137iob.6; Thu, 17 Jan 2019 16:43:28 -0800 (PST) X-Received: by 2002:a5e:8d04:: with SMTP id m4mr8534997ioj.233.1547772208763; Thu, 17 Jan 2019 16:43:28 -0800 (PST) MIME-Version: 1.0 References: <201901172321.x0HNL2f4036088@repo.freebsd.org> In-Reply-To: Reply-To: cem@freebsd.org From: Conrad Meyer Date: Thu, 17 Jan 2019 16:43:17 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: svn commit: r343125 - head/sys/dev/ioat To: Kevin Bowling Cc: src-committers , svn-src-all@freebsd.org, svn-src-head@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 073E98E896 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.99 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.99)[-0.989,0]; REPLY(-4.00)[]; TAGGED_FROM(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 18 Jan 2019 00:49:12 -0000 On Thu, Jan 17, 2019 at 4:12 PM Kevin Bowling wrote: > > Out of curiosity are you using this driver? Any performance data? Yep. I don't have any hard numbers on hand but my recollection is it caps out at about 5 GB/s, total, on Broadwell. Our workload with it is predominantly unmapped 8kB copies but includes some 512 byte copies as well. My recollection is that the channels are logical and share a single DMA engine, so there's not much reason to use more than one of them. It may improve on future microarchs but I can't speak to those. Cheers, Conrad