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Date: Mon, 9 Nov 2015 11:04:29 +0000 From: "bugzilla-dae...@bugzilla.kernel.org" <bugzilla-dae...@bugzilla.kernel.org> To: "shemmin...@linux-foundation.org" <shemmin...@linux-foundation.org> Subject: [Bug 107551] New: IPV4 Reassembling Problem https://bugzilla.kernel.org/show_bug.cgi?id=107551 Bug ID: 107551 Summary: IPV4 Reassembling Problem Product: Networking Version: 2.5 Kernel Version: 4.2.3 Hardware: Other OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IPV4 Assignee: shemmin...@linux-foundation.org Reporter: bernd.weib...@siemens.com Regression: No I have an ipv4 reassembling issue using the latest Kernel (4.2.3) in an nios2 environment. I first noticed that issue when sending UDP-Pakets from an Host PC to my device. Each packet has a payload of 4096 Byte. Due to the MTU of 1500 Byte each packet will be split into three ip-packets. Approximately 1 of 200 Packets were not correctly reassembled by the Kernel, so they cannot be received within user-space. The command nstat says, that there are reassembling errors due to timeout, but at least in wireshark all packets are correctly displayed. Sometime the kernel issues a icmp-messages, saying that there was a timeout during ip reassembling. I fir9st thought that it might be a performance problem, so I increased the time between the packets to about one packet per 500 ms but without success. Then I decided to reduce the payload to 1024 Byte, because it might be a buffer (or TSE FIFO) problem. Now all packets are send into one ipv4 packet and there is nothing lost on the receiver side, but when I reduced the MTU of the host from 1500 to 800 byte (each datagram will be split into two packets now) the problem accurse again! So this might be a reassembling issue. -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
