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...your problem could also be related to the filesystem or network. Do you have jumbo frames (if yes, you should have them on clients and server)? You might think about disabling flow control on the switch and on the network card. Are there a lot of dropped packets? For network tuning, check http://fasterdata.es.net/host-tuning/linux/ Did you try to enable readahead (blockdev ?setra) on the filesystem? On the client side, changing the mount options helps. The default read/write block size is quite little, increase it (rsize, wsize), and use noatime. Cheers, Barbara > On 15 May 2020, at 09:26...

Hello All: I've been requested to add some TCP tuning parameters to some CentOS 5.4 systems. These tunings are for the TCP receive buffer windows: net.core.rmem_max net.core.wmem_max Information on this tuning is broadly available: http://fasterdata.es.net/TCP-tuning/linux.html http://www.speedguide.net/read_articles.php?id=121 Potential downsides are available: http://www.29west.com/docs/THPM/udp-buffer-sizing.html >From the above, the rmem size is a function of the number of listening processes times the size of the receive buffer. Apa...

...d also be related to the filesystem or network. > > Do you have jumbo frames (if yes, you should have them on clients and server)? You might think about disabling flow control on the switch and on the network card. Are there a lot of dropped packets? > > For network tuning, check http://fasterdata.es.net/host-tuning/linux/ > > Did you try to enable readahead (blockdev ?setra) on the filesystem? > > On the client side, changing the mount options helps. The default read/write block size is quite little, increase it (rsize, wsize), and use noatime. > > > Cheers, > Barbar...

Le 13/05/2020 ? 07:32, Simon Matter via CentOS a ?crit?: >> Le 12/05/2020 ? 16:10, James Pearson a ?crit?: >>> Patrick B?gou wrote: >>>> Hi, >>>> >>>> I need some help with NFSv4 setup/tuning. I have a dedicated nfs server >>>> (2 x E5-2620? 8cores/16 threads each, 64GB RAM, 1x10Gb ethernet and 16x >>>> 8TB HDD) used by two