bdp s470

, napi );15901591/* clear the halt bit in rstat */1592 gfar_write ( priv-> regs-> rstat, rstat_clear_rhalt );15931594 gfar_write ( priv-> regs-> imask, imask_default );15951596/* If we are coalescing interrupts, update the timer */1597/* Otherwise, clear it */1598 if (priv-> rxcoalescing)1599 gfar_write ( priv-> regs-> rxic,1600 mk_ic_value (priv-> rxcount, priv-> rxtime ));1601 else1602 gfar_write ( priv-> regs-> rxic, 0 );1603}16041605 return howmany;1606}1607 # endif /* Gfar_clean_rx_ring ()

bandwidth (link bandwidth) (the rate at which messages are transmitted over the network) and round-trip times (round-trip time) or RTT (the delay between the sending of a message and the response received to the other end). These two values determine what is called the Bandwidth Delay Product (BDP).Given the link bandwidth and RTT, you can calculate the value of the BDP, but what does that mean? The

kernel will also try to fill the entire buffer (and also need to keep the TCP Notification window open ). In this way, you can minimize the number of calls and achieve better overall performance. The performance of TCP depends on several factors. The two most important factors are:Link bandwidth)(Packet transmission rate on the network) andRound-trip time)Or RTT (the delay between sending a message and receiving a response from the other end ). These two values are identifiedBandwidth Delay Pr

are the link bandwidth (link bandwidth) (the rate at which messages are transmitted over the network) and round-trip times (round-trip time) or RTT (the delay between the sending of a message and the response received to the other end). These two values determine what is called the Bandwidth Delay Product (BDP). Given the link bandwidth and RTT, you can calculate the value of the BDP, but what does that me

to minimize the number of times these calls are used. Fortunately, we can control this process. 　　Solution When writing data to a socket, try to write all the data at a time, instead of performing multiple write operations. For read operations, it is best to pass in the maximum buffer that can be supported, because if there is not enough data, the kernel will also try to fill the entire buffer (and also need to keep the TCP notification window open ). In this way, you can minimize the number of

performing multiple write data operations. For a read operation, it is best to pass in the maximum buffer that can be supported, because if there is not enough data, the kernel will attempt to populate the entire buffer (in addition to keeping the TCP Advertisement window open). This way, you can minimize the number of calls and achieve better overall performance. Back to top of pageTip 3. To adjust the TCP window for Bandwidth Delay ProductThe performance of TCP depends on several factors. The

We are very familiar with UDP. Here we will introduce the UDT protocol. The two protocols are easy to confuse in terms of abbreviations. You must first distinguish them clearly. Next, let's compare and differentiate this part of content. 1. Introduction With the increase of network bandwidth latency products (BDP), the TCP protocol is usually becoming inefficient. This is because its AIMDadditive increase multiplicative decrease) algorithm completely

operations, it is best to pass in the maximum buffer that can be supported, because if there is not enough data, the kernelIt will also try to fill the entire buffer (and also need to keep the TCP Notification window open ). In this way, you can minimize the number of calls and achieve better overall performance. Tip 3. Adjust the TCP window for the bandwidth Delay Product TCPThe performance depends on several factors. The two most important factors are the link bandwidth (linkbandwidth) (pack

congestion, this phase has a variety of algorithm implementations, usually keep the default can be, here is not one of the explanations, interested readers can check themselves. ... How to adjust "rwnd" to a reasonable value A lot of people have encountered the network transmission speed is too slow problem, for example, clearly is the hundred gigabit network, its maximum transmission of the theoretical value of the data also have to have a 10 trillion, but the actual situation is far apart,

and transmit queues by observing: RX errors: Total number of packets received RX dropped: Indicates that the packet has entered Ring Buffer , but due to insufficient memory for system reasons, it is discarded during the copy-to-memory process. The RX overruns:overruns means that the packet is Ring Buffer discarded by the physical layer of the NIC, and that the CPU is not able to handle interrupts in a timely manner Ring Buffer , such as uneven distribution of interrupts.

Http://www.shl.com/TryATest/TakeaTest/default.aspx Original address: http://bbs.yingjiesheng.com/thread-477-1-1.html thanks to the landlord to share ~ Now more and more foreign-funded enterprises (including investment banks, commercial banks, and the MT program of the industry) have included the online test or on-site test into the application process, many of the company's test problems come from an organization named SHL. I have participated in some investment banks (UBS, ML, HSBC Ib), hsbc

few months ago to achieve bbr similar things, but I can not imagine cubic so complicated things, the reason why Reno/cubic was used for more than 30 years, because people always think that is the right approach, No one seems to think that this is a problem.A new model based on the orthogonal base of {rtt,delivery rate} As one comes out, people seem to see the truth of the truth suddenly:The root of the problem is that the BBR congestion control model and the congestion control model prior to BB

the data structure is not well defined. And it's good for future maintenance.: Because you can see from the code that the data access is guaranteed to be volatile.Example: Exactly which volatile may be invalidIn the first few examples, it may be better to look at this example when you feel like you've already figured it out.struct hw_bd{..... volatile Char volatile buffer;}; struct hw_bd* bdp;......bdp