The tx queue length of eth0 can also be adjusted using ifconfig eth0 txqueuelen 3000.Both server deals with a lot of concurrent large file transfers.
But network performance is very poor for large files and performance degradation take place with a large files. How do I tune TCP under Linux to solve this problem By default the Linux network stack is not configured for high speed large file transfer across WAN links. You can easily tune Linux network stack by increasing network buffers size for high-speed networks that connect server systems to handle more network packets. In other words set the amount of memory that is allocated for each TCP socket when it is opened or created while transferring files. However, if the latency is large, the default size might be too small. Please note that the following settings going to increase memory usage on your server. If set, TCP will not cache metrics on closing connections. Set maximum number of packets, queued on the INPUT side, when the interface receives packets faster than kernel can process them. Now reload the changes: sysctl -p Use tcpdump to view changes for eth0: tcpdump -ni eth0. These are for servers with lots of traffic generated while transferring large files. Im glade that information helped you to understand new things. Increase Serial Port Buffer Size Linux Manual Tuning CanAuto tuning had a very conservative thresholds that are much lower the the a manual tuning can acheve. However, I lost my data file with trasfer per rate per sec by received size. However, you can easily test things your self try comparison with socket buffer 4 KB and 132 bytes. I have a very large number of small connections (client connects via TCP, sends a message that has a maximum size of 64K, and disconnects). The client may reconnect to send an additional message, but EVERY message has its own connection. I need to handle 20K (and perhaps over 40K) connections per second over GigE; my server seems to be similar in some ways (32GB of RAM on a SAN, running vanilla Linux 5.2 x86-64, with 2 Quad Core Opterons). Any other tuning that might be helpful that you can recommend. Increase Serial Port Buffer Size Linux Driver Using EthtoolCheck the ring buffer sized on your driver using ethtool -g. I used 30000 on a 10gig link but I think this may also be related to the max ring buffer size. Would be interested to know whick buffer the backlog is dumped into.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |