From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id D14A7A0613 for ; Thu, 29 Aug 2019 16:43:07 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 10BD01DF96; Thu, 29 Aug 2019 16:43:07 +0200 (CEST) Received: from mail-lj1-f169.google.com (mail-lj1-f169.google.com [209.85.208.169]) by dpdk.org (Postfix) with ESMTP id E93CE1BF31 for ; Thu, 29 Aug 2019 16:43:05 +0200 (CEST) Received: by mail-lj1-f169.google.com with SMTP id h15so3273955ljg.10 for ; Thu, 29 Aug 2019 07:43:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ruo0/JO0T9B3vvHrOhBviMl6UaIbbEJK+vJGTYMxfsI=; b=kIFCah55OLfYzjxakhjkC4lpBX+Jo8gLUgPNfXU2QEZLFKrKI4S+9BnprCidDkCbQi cxw9qFlbts5Y5rI5dYXS4Yv6msPFNSMxgkuBqB7ClC590SgtCvYjZv+WgTDhGzEzJkxK LlOWOPy6LoXX1r06Bo98W97+lhmK/ard8qCeQpCt/avG8xfZKPM+Jsbzo3UksYRbxTOu bn7j9Gq40yPQwRK0IGHPzziKNiEGnTUJpflEk2DmQLk2MWSk8EmQkHgbUrnNLfEOY76U lP8zFWZ6xPhaEjaF1UD17Pn7gbNQllZMMpFv81yUUrF0QFeAMZ8jFmINMflu4Lp4fG0G s7tQ== 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:from:date :message-id:subject:to:cc; bh=ruo0/JO0T9B3vvHrOhBviMl6UaIbbEJK+vJGTYMxfsI=; b=EVzu5yZum1OOPyU98PoJc+oZsekCTYGpD07lg23dPIn/VvahzVQrO1nV/wz45uQA9X F32k0KcvTVrYBaGUebLh2/YK+tu5lwjo4nW5Bqr5FApnNIlKTUDBfX7fapEoDYMd2cQg KIxO3WpUVv8jNO2vrfPLjGBfG4GLnsYVPaWotRMJ1+AsF+7P/KSuEzuY6Zgjut85golG yBSj6Y/iXpXnlcdkEYDuDPJxv0XvY49RHbwzlMBUFa5KQxexYcURjMf2KgdKO3CbYd1v CdIJS6EznESWrU4NahvHksyoJJ/k8XWXb9M4Xwx+xRx+WS50Inifn5rHn2syajQMj3ja NH8Q== X-Gm-Message-State: APjAAAVLcynZHPy+9PIF0MdSkFBi5DWk2xlbpWbPHRTnfY4KLJ4HXbgX Whn4kwRYe4VUZOlaNuSHfYhBCWFEBOB8HFbQr+gK7CXYNxs= X-Google-Smtp-Source: APXvYqycefPEJ2152UwwUvDnk7rRP1rO2fCEJpE0Noaqdyi3xnj4lgeN8mhOIO/28fIFBc9pTHjNABGxjzRnObKyENw= X-Received: by 2002:a05:651c:1104:: with SMTP id d4mr5564617ljo.90.1567089785203; Thu, 29 Aug 2019 07:43:05 -0700 (PDT) MIME-Version: 1.0 References: <20190829074001.578153a8@hermes.lan> In-Reply-To: <20190829074001.578153a8@hermes.lan> From: Venumadhav Josyula Date: Thu, 29 Aug 2019 20:12:54 +0530 Message-ID: To: Stephen Hemminger Cc: users@dpdk.org Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.15 Subject: Re: [dpdk-users] Drops seems with virtio PMD driver X-BeenThere: users@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK usage discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: users-bounces@dpdk.org Sender: "users" Hi Stephen, >Are you using KVM? Yes >Did you enable virtio net acceleration? Will get back to you. Can you let me what are benefits of it ? Thanks, Regards Venu On Thu, 29 Aug 2019 at 20:10, Stephen Hemminger wrote: > On Thu, 29 Aug 2019 10:12:27 +0530 > Venumadhav Josyula wrote: > > > Hi All, > > > > We are observing packet drops ~@90Mbs with virtio pmd driver. These > packets > > are not been > > queued in the tx descriptors, the function 'rte_eth_tx_burst' is > returning > > the less than n. > > > > So questions are following > > i) are there any issues seen ? > > > > Observations in our case :- > > i) packets are dropped and tx packets donot get incremented. > > ii) i) happens for 30 secs after that it recovers. > > iii) After sometime we see this issue in i) & ii) again. > > > > Any clues / pointers will help. > > > > Thanks, > > Regards, > > Venu > > The number of transmit descriptors is fixed. > If you are producing packets faster than the other consume them then the > transmit descriptor ring gets full. So the problem is probably on the other > side of your virtio. Are you using KVM? Did you enable virtio net > acceleration? >