Date: Sun, 18 Mar 2018 09:47:31 +0100 From: Gary Jennejohn <gljennjohn@gmail.com> To: current@freebsd.org Subject: network performance over 1GBps links degraded Message-ID: <20180318094731.52dba55b@ernst.home>
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I have two computers, both with 1Gbps interfaces plugged into a 1Gb switch. One computer is running FreeBSD HEAD and the other some version of Linux. Under FreeBSD I have re0 and under Linux I don't know what the hardware is. Both interfaces are using a MTU of 4088 because that's the maximum my re0 supports. I tend to copy files from one to the other using ftp fairly frequently. I noticed that the transfer speed has dropped to only about 12MBps. I'm used to seeing about 27MBps during the ftp transfers. I also observed the drop in transfer speed between FreeBSD and a Windows 10 computer. Formerly, I was seeing about 30MBps. Windows 10 also has MTU 4088 set. I tested with a FreeBSD kernel from March 7 and one from March 17, but both show the miserable performance. Unfortunately, I don't have any older kernels backed up. I can't say exactly when the performance degraded, but possibly there was some change to the kernel on or before March 7 which caused it. Has anyone else seen this? There were several changes to the networking stack lately. I wonder whether anyone has an idea what could be the cause of the performance degredation, and what sysctls I could set to get the old performance back. -- Gary Jennejohn
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