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[176.103.220.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e06e21fd9asm2270191a91.33.2024.09.25.20.45.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Sep 2024 20:45:55 -0700 (PDT) Date: Thu, 26 Sep 2024 05:45:52 +0200 From: Stefano Brivio To: David Gibson Subject: Re: Problematic throughput numbers Message-ID: <20240926054552.23969872@elisabeth> In-Reply-To: References: Organization: Red Hat X-Mailer: Claws Mail 4.2.0 (GTK 3.24.41; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID-Hash: ANI6RR47Z5D4BBXDV3SF6466F3NEM3OS X-Message-ID-Hash: ANI6RR47Z5D4BBXDV3SF6466F3NEM3OS X-MailFrom: sbrivio@redhat.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Jon Maloy , passt-dev@passt.top, dgibson@redhat.com, lvivier@redhat.com X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Thu, 26 Sep 2024 11:59:17 +1000 David Gibson wrote: > On Wed, Sep 25, 2024 at 12:36:43PM -0400, Jon Maloy wrote: > > I made many runs with iperf3 ns->host, and the results are puzzling me. > > Over and over again, I see throughput practically collapse, with a two > > orders of magnitude decrease. > > Just to make sure this wasn't something introduced by me, I went back to the > > master branch and disabled the SO_PEEK_OFF feature. > > The result was the same. > > The below log shows typical run, but it is highly variable. > > Sometimes almost the whole series is in the 50-70 Gb/s range, and sometimes > > almost all in the 100-300 Mb/s range. > > When I added the kernel fix it didn't seem to make any difference. > > > > To me this is really worrying, and should be investigated. > > Those numbers are certainly worrying. Like Stefano, though, I have ...not...? > encountered this myself. -- Stefano