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How to get the network buffer usage of some process

I have an Ubuntu server, which contains some user-processes. It always crashes after starting-up several hours. "crashes" means that I cannot neither ssh to it nor ping it anymore. I'm doubting that ...
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Is it useful for a proxy to buffer less data than Linux RCVBUF can?

I am looking at how HTTP proxies and reverse proxies deal with slow client problems. The idea is that the upstream server only have a limited slots for clients and if the client is slow to receive ...
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Buffer size for capturing packets in kernel space?

Going through the man page of tcpdump, it seems kernel can drop the packets if the buffer is full. I was wondering if: that size is configurable and/or where can I see the size for my distro? From ...