摘要：First confirm that you have root privilege. Second check the config of kernel that you have the configs on: Last you confirm you have your debugfs/tra 阅读全文

摘要：SACK: (selective ack), it is an option added to normal ack packets. Normally sack can specify at most 4 groups of seq_start, seq_end. Meaning bytes at 阅读全文

摘要：How the algorithm and formula are implemented seem trivial, the most important of the passage's idea is the definition of 'conservation of packets'. F 阅读全文

摘要：At kernel init, each logical core has a thread called ksoftirq/%d running. These threads are brought up by the initial function net_dev_init(). While 阅读全文

摘要：According to RedHat accessories, TCP_NODELAY: each call to write(fd, buf...) will be sent out as packet. This leads to poor overall performance when m 阅读全文

摘要：In linux mm folder, there are 3 files that about kmalloc/kmem, slab/slub/slob, where slab.c defines general memory usage, slub.c defines modern memory 阅读全文

摘要：Before using stap, the kernel-debuginfo-$(uname -r), kernel-debuginfo-common-$(uname -m)-$(uname -r) and kernel-devel-$(uname -r) should be installed. 阅读全文

摘要：ioctl is used in communication with modules of Linux. Module: User space In case of Makefile is needed: 阅读全文

摘要：From wiki quote: The Time Stamp Counter (TSC) is a 64-bit register present on all x86 processors since the Pentium. It counts the number of cycles sin 阅读全文

摘要：The following is concluded from here. Consider we have 2 interfaces: eth0 & eth1 bond the two interface: in ifcfg-eth0/ifcfg-eth1: remove IP/MASK/GW/U 阅读全文

摘要：Previously in windows, I uses ramdisk, to accelerate chrome browsing. However, in linux, this is made possible by tmpfs/ramfs already by default. Also 阅读全文

摘要：This file includes 4 data-structures.. Insteresting because they are written in 1994.. to make it easier using the structures.. LIST: the common usage 阅读全文

摘要：API defines the programning language and function entry point, arguments type, order. ABI defines the programming compiled version to be according to 阅读全文

摘要：Environment Build Step: these packages are needed for building dpdk+ovs: First download latest dpdk & ovs :http://dpdk.org/download git clone https:// 阅读全文

摘要：yum install -y epel-release glibc.i686 libtools vim clang git autoconf automake w3m glibc screen the most import sentence I learned in meeting compili 阅读全文

摘要：The float can be converted to well known single-precision IEEE 754 number, why 754? It's the standard representation of single-precision numbers, used 阅读全文

摘要：To prevent Memory Consistency Errors(MCEs), it is good practice to specify synchronized class specifier, and mark all the related methods as synchroni 阅读全文

摘要：Using BigDecimal to perform precise calculations with floats. BigDecimal is a class type. So declare/construct one BigDecimal is in the form like: Do 阅读全文