instructions5. Compile option Remove Debug and Trace, save instruction Cycle6. Turn on the hardware uninstall switch on the NIC (if any)7. Minimize the number of user-state processes and reduce their priority8). Native Network protocol stack optimizationSince no longer serves as a general purpose OS, the task of excluding Rx SOFTIRQ can be properly starved*CPU Group (consider the Linux cgroup mechanism), a uniform set of CPUs for the data surface CPU
Recently in the upgrade netback, during the testing process, found that the VM full-duplex pressure, rx PPS Volatility is very strong, see the RX Kthread Although the CPU affinity is 0-7 (Dom0 8vcpu), but often run to the physical interrupt of the CPU.By manually binding the RX Kthread CPU to the other CPUs,
Mode operation
After the reset response, the card is in one of the following two operation modes:
--If TA (2) exists, it is in a specific mode;
--If TA (2) does not exist, it is in the negotiation mode.
The figure shows how to select and switch the card operation mode.
1. Specific Mode
In a specific mode, the Protocol indicated by TA (2) should be used directly after the reset response
-- If B5 = 0 in Ta (2), use Fi and di;
-- If B5 = 1 in Ta (2), use an implicit value.
However, IFD can enable
parts: 1. Infrastructure: All hardware resources; 2. Smart services: network management, high availability; 3. Various services: IP phones;Today's enterprise network model is based on the AVVID architecture: enterprise parks, enterprise boundaries, and service provider boundaries;Implement a three-layer hierarchical model in the above three regions;E-commerce: the connection between your enterprise and business partners;VPN: used to upload private network information on the public network;Enter
`.`program_name` AS `program_name`FROM `sys`.`processlist`WHERE `processlist`.`conn_id` IS NOT NULL AND `processlist`.`command`
Continue with the definition of processlist.
SELECT `pps`.`THREAD_ID` AS `thd_id` ,`pps`.`PROCESSLIST_ID` AS `conn_id` , if(`pps`.`NAME` = 'thread/sql/one_connection', concat(`pps`.`
of the signal, keeping the low-frequency signal, to compensate the transmission line attenuation of the signal, improve the performance of the eye graph and guarantee the transmission quality.3 Xilinx FPGA Transceivers3.1 system ArchitectureThe 7 Series FPGAs GTX and GTH transceivers is power-efficient transceivers, supporting line rates from $ MB/s to 12.5 GB/s for GTX transceivers and 13.1 Gb/s for GTH transceivers. Four Gtxe2_channel Primitives and one Gtxe2_common primitive to be a Quad.The
Linux has become more and more popular among computer users. As a result, many people begin to learn about the Linux operating system. Here we will introduce how to install the PPStream network TV Linux version under Fedora, I will share it with you here. I'm glad that totem is becoming more and more powerful. You can play rm, rmvb, wmv, mkv, dvd, and other formats without installing totem-xine. The only thing you are not satisfied with is that there are no subtitles on the DVD ~~
There are many
internally cached, that is, the device memory that is commonly referred to. From the source-host angle of data transmission, the DMA channel ends with RAM and device memory respectively. Device memory is generally selected using fast low-power SRAM materials, such as the AR9331 switching chip PCU Unit has 4KB TX FIFO and 2KB rx FIFO, "The GE0 and GE1 support 2K transmit FIFO and 2K receive F IFO. "
The most used Dmac are disk drives and other slow de
libx264 version isLIBFAAC version is 1.28 1, the division of the frame1.1 H-Framesthe definition of each frame is for H. xx or xx. For example, the following H264 file fragment this contains three frames of data: E0 9F 96 10 00 (C0)In the F1 of the 2A (XX) 3C (CE) 5D DC E9 BDE6 D9 B7 2C D8 D9 EE EF ... The first frame is the xx-C0-DA-E0-9F, which was F1 2A.the second frame is xx 3C 80The third frame is the FF FF 5D DC E9 BD E6 D9 B7 2C D8 D9 EE EF. frame type: nal_slice = 1 NAL_SLICE
I believe that a lot of netizens are using Peer-to-peer technology network TV clients to enjoy the wonderful network TV/movie, at the same time, there must be many friends of the use of Peer-to-peer network television when some of the problems caused by complaints, such as the connection speed is too slow, often buffer, the software occupies too large resources, in the intranet can not watch and so on. In fact, for these problems, most software developers have provided the response measures, as
Reactive extensions team blognews about reactive extensions for. Net Silverlight
Announcing reactive extensions (RX) for. Net Silverlight
Finally, the long wait is over. Rx is available onDevlabs! What is RX? Rx is. Net Library that allows programmers to write succinct declarative code to orchestrate and c
research on OFFICE security to drive reform in detection and protection. Recently, we have seen an increasing number of attacks against the Sandworm vulnerability. Most importantly, the threat owner has introduced some interesting detection and avoidance technologies. We hope to share them with the security community.
PPSX and PPS
We have seen quite a lot of Sandworm attacks (CVE-2014-4114) disguised. pps
without booting
[Root@xiaoluo ~]# chkconfig--list | grep networkmanager
NetworkManager 0:off 1:off 2:off 3:off 4:off 5:off 6:off
After stopping the NetworkManager service we can use IP alias technology to configure multiple IP addresses, here we use the IP command, the command syntax format is as follows:
IP addr Add 172.25.215.40/24 dev Etho label eth0:0
Behind the eth0:0 says, we add an IP alias to eth0 this network card, the latter 0 means a name, the second alias
:[Root@pps ~]# season= ("srping" "Summer" "Autumn" "Winter")When you find that the assignment is wrong, you can also immediately correct the new assignment, as Spring above is written as srping.Re-assignment: (The original value is overridden)[Root@pps ~]# season= ("Spring" "Summer" "Autumn" "Winter")
Check out the environment variables:[Root@pps ~]# Set | grep
While ["$i"-lt $n]; Todo
echo "Please input strings ... ' expr $i + 1 '"
Read array[$i]
b=${array[$i]}
echo "$b"
i= ' expr $i + 1 '
Done
2, put the letters in the string into the array, and output to the "standard output"
Copy Code code as follows:
#!/bin/bash
chars= ' ABCDEFGHIJKLMNOPQRSTUVWXYZ '
for ((i=0; iarray[$i]=${chars: $i: 1}
echo ${array[$i]}
Done
What's interesting here is ${chars: $i: 1}, which means to get 1 characters starting
[[email protected] ~]# Chkconfig--list | grep networkmanagernetworkmanager 0:off 1:off 2:off 3:off 4:off 5:off 6:offAfter stopping the NetworkManager service we can use IP alias technology to configure multiple IP addresses, here we use IP This command, the command syntax format is as follows:IP addr Add 172.25.215.40/24 dev Etho label eth0:0Behind the eth0:0 Said, we give eth0 this nic add an IP alias, the back of that 0 means the name, the second alias can be written eth
Pageddatasource PPS = New Pageddatasource ();PPS. datasource = DT. defaultview; // Set the data source (datatable type) PPS. allowpaging = True ; // Number of lines displayed on the page PPS. pagesize = 18 ; // Set current page If (Pageindex 1 ) Pageindex = 1 ;
Why does UART need FIFO?
Modern CPUs run faster and faster. UART usually has a baud rate of less than 10 M. In the absence of FIFO, CPU time is consumed for each data filling to or from UART, this is a great waste. Therefore, the UART is configured with FIFO as the buffer for data sending and receiving on the hardware. Each time the CPU needs to fill in the data, it will fill in the uart tx fifo. Each time the CPU needs to get the data, the data will be retrieved from the uart
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