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26 wrz 2012 · Kernel memory: tells you how much memory is in use by the kernel and device drivers. I believe (but I could be wrong here) the numbers here are virtual memory counts. For non-paged memory, there's no difference: the virtual memory is always resident in physical memory. For paged memory, the size is virtual; the physical memory occupancy could ...
14 mar 2018 · You're doing zero-copy networking when you never copy the data between the user-space and the kernel-space (I mean memory space). By example: C language recv(fd, buffer, BUFFER_SIZE, 0); By default the data are copied: The kernel gets the data from the network stack; The kernel copies this data to the buffer, which is in the user-space.
21 gru 2022 · In this series, we will be exploring the way networking in the server world and how it evolved from using the traditional Linux Kernel Networking stack to network virtualization using OVS and towards handling the load of Telco using NFV and SR-IOV.
For a network device with a single transmission queue, XPS configuration has no effect, since there is no choice in this case. In a multi-queue system, XPS is preferably configured so that each CPU maps onto one queue.
27 gru 2011 · For a TCP connection memory consumed depends on. size of sk_buff (internal networking structure used by linux kernel) the read and write buffer for a connection. the size of buffers can be tweaked as required. root@x:~# sysctl -A | grep net | grep mem check for these variables
In physical memory the kernel usually resides at a random offset above 0x1000000. This depends on the kernel configuration options CONFIG_PHYSICAL_START, CONFIG_PHYSICAL_ALIGN and CONFIG_RANDOMIZE_BASE and the kernel command line options kaslr / nokaslr as described in the linux-insides book.
8 sty 2024 · The kernel provides many services related to I/O. Several services such as scheduling, caching, spooling, device reservation, and error handling – are provided by the kernel’s I/O subsystem built on the hardware and device-driver infrastructure. The I/O subsystem is also responsible for protecting itself from errant processes and malicious users.
