From mboxrd@z Thu Jan 1 00:00:00 1970 From: Euan Kemp Subject: Re: Performance regression with virtio_net Date: Mon, 31 Jul 2017 11:38:00 -0700 Message-ID: <20170731183800.4jg2qx42sheq7axw@multivac.euank.com> References: <20170730222552.4fxxnx3jxg4yv65g@multivac.euank.com> <20170731161903-mutt-send-email-mst@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: seth.forshee@canonical.com, netdev@vger.kernel.org To: "Michael S. Tsirkin" Return-path: Received: from mail-pf0-f170.google.com ([209.85.192.170]:34881 "EHLO mail-pf0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751438AbdGaSiD (ORCPT ); Mon, 31 Jul 2017 14:38:03 -0400 Received: by mail-pf0-f170.google.com with SMTP id t86so14343847pfe.2 for ; Mon, 31 Jul 2017 11:38:02 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20170731161903-mutt-send-email-mst@kernel.org> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, Jul 31, 2017 at 04:26:08PM +0300, Michael S. Tsirkin wrote: > I kept this around unchanged from > ab7db91705e95ed1bba1304388936fccfa58c992. That commit had an internal > reason not to account for that space: not enough bits to do it. No > longer true so let's account for length exactly. I'll send a proper > patch after a bit of testing, would appreciate reports reports of > whether this helps very much. I can confirm your patch fixes the issue for me. - Euan