From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id EF07045A9F; Thu, 3 Oct 2024 13:47:13 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id C201F40299; Thu, 3 Oct 2024 13:47:13 +0200 (CEST) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by mails.dpdk.org (Postfix) with ESMTP id B5E5640298 for ; Thu, 3 Oct 2024 13:47:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727956032; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=LXZwWoOSVlOPeBwepqvBeZz+zCQixjlro8PxACMrqm0=; b=ZAJOuuCnqgvXNPpcERy7hoJXJdn6C+wpS54Va1hhcpSELveHy+ehpDxZdK/QR8AC3uiOUp Wz+D18eqVLuNR69mqwEmWOEj3PL5LyalnNOiU4UAMPrA6tLh6VkcbW+el3FX/KzyQaPFg1 MkYmOtmOs1vtpDFXVcFlbfAhU0iFIVA= Received: from mx-prod-mc-05.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-551-b2cK8bXmPBi6WBTW75LP9A-1; Thu, 03 Oct 2024 07:47:09 -0400 X-MC-Unique: b2cK8bXmPBi6WBTW75LP9A-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (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-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B2A4F195608C; Thu, 3 Oct 2024 11:47:06 +0000 (UTC) Received: from [10.39.208.26] (unknown [10.39.208.26]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DF40619560A3; Thu, 3 Oct 2024 11:47:02 +0000 (UTC) Message-ID: Date: Thu, 3 Oct 2024 13:46:59 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 7/7] vhost: optimize memcpy routines when cc memcpy is used To: =?UTF-8?Q?Mattias_R=C3=B6nnblom?= , dev@dpdk.org Cc: =?UTF-8?Q?Mattias_R=C3=B6nnblom?= , =?UTF-8?Q?Morten_Br=C3=B8rup?= , Stephen Hemminger , David Marchand , Pavan Nikhilesh , Bruce Richardson References: <20240724075357.546248-2-mattias.ronnblom@ericsson.com> <20240920102716.738940-1-mattias.ronnblom@ericsson.com> <20240920102716.738940-8-mattias.ronnblom@ericsson.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 9/20/24 12:27, Mattias Rönnblom wrote: > In build where use_cc_memcpy is set to true, the vhost user PMD > suffers a large performance drop on Intel P-cores for small packets, > at least when built by GCC and (to a much lesser extent) clang. > > This patch addresses that issue by using a custom virtio > memcpy()-based packet copying routine. > > Performance results from a Raptor Lake @ 3,2 GHz: > > GCC 12.3.0 > 64 bytes packets > Core Mode Mpps > E RTE memcpy 9.5 > E cc memcpy 9.7 > E cc memcpy+pktcpy 9.0 > > P RTE memcpy 16.4 > P cc memcpy 13.5 > P cc memcpy+pktcpy 16.2 > > GCC 12.3.0 > 1500 bytes packets > Core Mode Mpps > P RTE memcpy 5.8 > P cc memcpy 5.9 > P cc memcpy+pktcpy 5.9 > > clang 15.0.7 > 64 bytes packets > Core Mode Mpps > P RTE memcpy 13.3 > P cc memcpy 12.9 > P cc memcpy+pktcpy 13.9 > > "RTE memcpy" is use_cc_memcpy=false, "cc memcpy" is use_cc_memcpy=true > and "pktcpy" is when this patch is applied. > > Signed-off-by: Mattias Rönnblom > --- > lib/vhost/virtio_net.c | 37 +++++++++++++++++++++++++++++++++++-- > 1 file changed, 35 insertions(+), 2 deletions(-) > As the default behaviour remains unchanged, this is good to me: Acked-by: Maxime Coquelin Thanks, Maxime