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[34.85.134.180]) by smtp.gmail.com with UTF8SMTPSA id 00721157ae682-79a903e0b8csm73393107b3.12.2026.03.24.07.53.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 07:53:37 -0700 (PDT) Date: Tue, 24 Mar 2026 10:53:37 -0400 From: Willem de Bruijn To: Eric Dumazet , "David S . Miller" , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Neal Cardwell , Kuniyuki Iwashima , Willem de Bruijn , netdev@vger.kernel.org, eric.dumazet@gmail.com, Eric Dumazet Message-ID: In-Reply-To: <20260324142556.1844523-1-edumazet@google.com> References: <20260324142556.1844523-1-edumazet@google.com> Subject: Re: [PATCH net-next] selftests/net: packetdrill: add CONFIG_MAX_SKB_FRAGS=17 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Eric Dumazet wrote: > Before adding tests about RWIN, enforce the default linux value > for the number of fragments per skb. > > With 17 fragments, sizeof(skb_shared_info) == 320. > > With 45 fragments, sizeof(skb_shared_info) == 768. > > Signed-off-by: Eric Dumazet > --- > tools/testing/selftests/net/packetdrill/config | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/tools/testing/selftests/net/packetdrill/config b/tools/testing/selftests/net/packetdrill/config > index c4a19a78552111df690d2c97c0f3a8abe2176ada..8c739db4752c3abaaa8862ea2aeb661a2d5f0575 100644 > --- a/tools/testing/selftests/net/packetdrill/config > +++ b/tools/testing/selftests/net/packetdrill/config > @@ -1,6 +1,7 @@ > CONFIG_HZ=1000 > CONFIG_HZ_1000=y > CONFIG_IPV6=y > +CONFIG_MAX_SKB_FRAGS=17 > CONFIG_NET_NS=y > CONFIG_NET_SCH_FIFO=y > CONFIG_NET_SCH_FQ=y Why do we need to make this explicit, if it is the default?