From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yi Yang =?unknown-8bit?b?5p2o77+9RC3kupHmnI3liqHpm4blm6I=?= Date: Tue, 4 Feb 2020 15:34:16 +0000 Subject: [Intel-wired-lan] bad iperf3 tcp performance of Intel 10G NIC when MTU is 9000 Message-ID: <6bc9d97b27a24cf79edadedf502caf06@inspur.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: Hi, all We find a very weird issue on Intel 10G NIC, iperf3 tcp performance is good when MTU is 1500, but it is about one third of the former when MTU is 9000, anybody knows why it is so, is any solution to it available? The below is our kernel and ixgbe deriver information: Ubuntu 16.04 and kernel is updated to 4.15.0-36-generic x86_64 Ixgbe driver version: 5.1.0-k Firmware version: 0x61c10001 BTW, tso is on. -------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/pkcs7-signature Size: 3600 bytes Desc: not available URL: