From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wr0-f173.google.com (mail-wr0-f173.google.com [209.85.128.173]) by dpdk.org (Postfix) with ESMTP id 238A2A486 for ; Tue, 13 Mar 2018 13:45:14 +0100 (CET) Received: by mail-wr0-f173.google.com with SMTP id r8so7122920wrg.0 for ; Tue, 13 Mar 2018 05:45:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=HZ9cbG6DwMzZGJt6ECD9TlQ4hVJqWn3rHAW8l2p4PRQ=; b=VUr9a85mQg+95qMY3RGuBbO0hMnh7Ejmox5WCFzQHsrmtb/ohNEh6tJLMNLObb98IV pMFhyZsbD/cEBc7bEeBwDCjWBn6bQ9aayc6HBmcuTz0rNbb5KyZ+Vl9X/qbs1jHnKkOL aR6/0oGrGYNuVWTZIANTDJvu7lxH0Z5x68XlvDaU3bbgRMud2X061278tIkOfxQx4WUK fdY7a1HsJPU5sYbarXHuShP4zzKfV5TVI+mqBVFJX/fjQ/2AoQYxtaui3qNg/isorY+2 hbHSQdKiv1Rm8WogrsT1YqsjaQQm7Cdnw5KiSpzCrXbOm6z4DajoNCYkYauxSBQORMKv oanA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=HZ9cbG6DwMzZGJt6ECD9TlQ4hVJqWn3rHAW8l2p4PRQ=; b=RQI/4j0DA6ubTyG6oNBiCgityBYyZ5Jxkrq/wsnRxZ/CFFyE7sE4GJODU+ZWTr++tI TWceJCLpEw8P90sAjW4rEMTwhODytcZTB4AYMF55qbBBo8ryu6U8XxjaedD4V08mqMZJ MOrJyI5gsSiB7+t6SuaS9cmto66bFJ9CaL9ZA4M2E720ockJO1qaMKs9Q3UinQSfJwiq W2/rzxOV1qCurKzc2iQZqLxzjaoPEYJvbyHXfipXw3jb5vzG4eI70Xr4yb5G/hsqnU1X Dc9QjISpUmovC5AR4IHSKYEX99tbJm4w8uxP0OZeRlvVXF1Q+bHCn62g0yFBqHGwYlno mhJg== X-Gm-Message-State: AElRT7HBpZVa5+VCKI3oUQt1K1SXh6EfIFZ+oUaliL+Tf36CnYkG/9Tk dATk1cEjlfJ3rZR311IIJsyC3A== X-Google-Smtp-Source: AG47ELtVmdxjYpOva5G/0sv9v/11MxSznmee23i42fwu1A34D2UDHKQPcPVohAt+YO9Gqqk4xfpkew== X-Received: by 10.28.193.134 with SMTP id r128mr675131wmf.85.1520945113752; Tue, 13 Mar 2018 05:45:13 -0700 (PDT) Received: from 6wind.com (host.78.145.23.62.rev.coltfrance.com. [62.23.145.78]) by smtp.gmail.com with ESMTPSA id h188sm110937wmf.37.2018.03.13.05.45.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Mar 2018 05:45:12 -0700 (PDT) Date: Tue, 13 Mar 2018 13:44:59 +0100 From: Adrien Mazarguil To: Yongseok Koh Cc: nelio.laranjeiro@6wind.com, dev@dpdk.org Message-ID: <20180313124459.GI3994@6wind.com> References: <20180312170545.16165-1-yskoh@mellanox.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180312170545.16165-1-yskoh@mellanox.com> Subject: Re: [dpdk-dev] [PATCH] net/mlx5: remove excessive data prefetch X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2018 12:45:14 -0000 On Mon, Mar 12, 2018 at 10:05:45AM -0700, Yongseok Koh wrote: > In Enhanced Multi-Packet Send (eMPW), entire packet data is prefetched to > LLC if it isn't inlined. Even though this helps reducing jitter when HW > fetches data by DMA, this can thresh the LLC with evicting precious data. > And if the size of queue is large and there are many queues, this might not > be effective. Also, if application runs on a remote node from the PCIe > link, it may not be helpful and can even cause bad results. > > Signed-off-by: Yongseok Koh Acked-by: Adrien Mazarguil -- Adrien Mazarguil 6WIND