Experimental Physics and Industrial Control System
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Are there guidelines for tuning the network parameters for a Linux host running a bunch of EPICS soft IOCs? We were seeing some issues with CA clients seeing delays of over a second for ‘get' requests. Setting the values shown here: net.core.netdev_max_backlog = 5000 net.core.rmem_max = 8388608 net.core.wmem_max = 8388608 net.core.rmem_default = 124928 net.core.wmem_default = 124928 net.ipv4.tcp_rmem = 4096 87380 8388608 net.ipv4.tcp_wmem = 4096 65536 8388608 net.ipv4.tcp_mem = 8388608 8388608 8388608
seems to have improved things. But I don’t know if those numbers, which I got from a google search, are way too big, or not yet big enough or completely weird. Suggestions welcomed.
Machine details: - 8 cores
- 24 GiB RAM
- 1 TB SSD
- Gigabit Ethernet
- EPICS R3.15.4
Load average in the 3 to 4 range but CPU utilization as shown by ‘top’ showed at least 60% idle even when clients were experiencing the slow response.
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- Replies:
- Re: Linux network tuning Kyle Lanclos
- Re: Linux network tuning Fors, Thomas L.
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ANJ, 05 Oct 2018 |
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