Xogta^(Data) waxaa lagu wareejiyaa shabakada iyo internetka^(Internet) iyadoo la adeegsanayo habka TCP/IP Protocol . TCP / TCP/IP ma fiicna laakiin way fududahay in la fuliyo marka la barbar dhigo hab-maamuuska kale ee loo eegayo isgaarsiinta xogta… sida qaabka ISO OSI . Sida shay kasta oo farsamo, TCP/IP sidoo kale waxay leedahay cillado qaarkood iyo Silly Window Syndrome waa abuurista mid ka mid ah cilladahaas. Si aad u fahamto waxa uu yahay Silly Window Syndrome ama SWS , waxaad marka hore u baahan doontaa inaad fahanto habka hoose ee xidhiidhka xogta ee TCP/IP .

Daaqadda nacasnimada ah

Fahamka daaqadda iyo cabbirkeeda

Marka laba dhibcood ay ku wada xiriiraan TCP/IP , waxay ku lug leedahay habka qirashada. Habkan qirashada ayaa ah waxa sababa Silly Window Syndrome sida lagu sii sharaxay. Dhibcuhu waxay tixraaci karaan laba kombiyuutar, macmiil iyo server, iwm.

SWS is caused by the receiver advancing the right window edge whenever it has any new buffer space available to receive data and by the sender using any incremental window, no matter how small, to send more data. The result can be a stable pattern of sending tiny data segments, even though both sender and receiver have a large total buffer space for the connection, says MSDN.

Marka kombuyuutarku, dheh A, u diro xirmo xog kombuyuutar kale, kan dambe waa inuu qiraa oo ka jawaabaa inuu helay xirmada xogta. Iyada oo ay la socoto qirashada, waa inay sidoo kale dirtaa cabbirka kaydinta loo qoondeeyay dunta isgaarsiinta. Tani guud ahaan waa tirada bytes ee loo xoreeyay isgaarsiinta.

Marka marka B uu yiraahdo 100B ayaa diyaar u ah fariinta xigta, 100B waa daaqada Silly Window Syndrome . Taasi waa, waa cabbirka kaydka. Iyada oo cilad u gaar ah, habka TCP/IP ayaa laga yaabaa inuu yareeyo cabbirka bakhaarka ee isgaarsiin kasta / xog kasta oo ka imanaysa A. Taasi waa, mar kasta oo A soo diro fariin, B waxay u maleyneysaa in cabbirka baqdinta la dhimay oo diro tiro yar. Sidaas awgeed cabbirka daaqadu wuu sii yaraanayaa oo marka la gaadho, isgaadhsiintu waxa ay joogsanaysaa marka B u soo diro 0B cabbirka daaqada.

Sidee U Shaqeeyaa Daaqadda Nacasnimada ah

Marka loo eego tusaalaha sare ee A iyo B, haddii B u soo dirto 1000B cabbirka daaqadda, A waxay u kala qaybin doontaa laba 500B oo waxay diri doontaa laba baakidh oo 500B ah. Marka la helo xirmada koowaad, B waxay soo diri doontaa qirasho leh 500B ayaa diyaar u ah daaqada maadaama baakidhka labaad aan weli la helin. A waxa uu u malaynayaa in 500B ay tahay cabbirka daaqada oo uu soo diro laba baakidh oo 250B ah. Halka B, 500B la isticmaalo iyo 500 hadda la helay, waxay soo diri doontaa 0B sida la heli karo. Halkaa marka ay marayso, A waxa ay u qaadanaysaa in aanu jirin daaqad la heli karo in kasta oo ay dhici karto in kaydku madhan yahay maadaama processor-ku uu xogta halkaas u isticmaalay. A ayaa wali soo diri doonta baakidh ka yar si loo eego in daaqad la heli karo iyo in kale. Haddi waxa ku jira kaydka B aan wali la saarin, waxa ay wali heli doontaa 0 jawaab celin ahaan.

Sidaa darteed, cabbirka daaqadu wuu sii yaraanayaa marka B ay soo dirto qirasho mar kasta oo ay ka hesho baakidh A. Cabbirkani inta badan wuu ka yar yahay qirashadii hore maaddaama B ay helayso baakado xog ah qaybo. Dhibaato ma jiri doonto haddii A ay soo diri karto baakidh weyn oo ku filan si ay u daboosho cabbirka baska ee B markiiba. Laakiin taasi waxay u baahan doontaa habab dheeraad ah oo markaa Silly Window Syndrome . Xiriirku wuxuu joogsadaa ka dib marka A helo 0 laba ama saddex jeer.

Sida Looga Hortago Cudurka Daaqadda Nacasnimada ah^{(Silly Window Syndrome)} ( SWS )

Waxaa jira algorithm fudud oo la hirgeliyo si looga takhaluso SWS . Marka la helo xirmada bilowga ah, B waxay soo dirtaa kala bar meesha dhabta ah ee la heli karo sida daaqadda. Taasi waxay ka dhigi doontaa A soo diri baakado yaryar. Sidaas awgeed, marka baakidhyadu aad u yaraadaan, ka dib B waxay soo dirtaa cabbirka guud ee bakhaarka si uu A u bilaabo dirida xogta weyn mar kale.

Si kale haddii loo dhigo, haddii 1000B la heli karo, B waxay soo dirtaa 500B qirasho ahaan. Sidaas awgeed, A waxay soo dirtaa 250B x ​​2 baakidh. Taas awgeed, A waxa uu helayaa 100B qirasho ahaan. Marka ay hesho baakidh 50B ah, B waxa ay u dirtaa 1000B – 50B A. Taas oo ka dhigaysa in wada hadalka oo dhan uu mar kale shaqeeyo. Tani waxay keeni kartaa dib u dhac yar oo ku saabsan habaynta laakiin waxay ka ilaalin doontaa Silly Window Syndrome inuu dhaco oo joojiyo wada hadalka oo dhan.

Marka la soo koobo, SWS waxay ku salaysan tahay cabbirka kaydka uu heli karo qaataha iyo cabbirka la malaynayo ee uu xisaabiyay soo diraha. Si looga hortago SWS , dib u dhac ayaa la soo bandhigaa oo cabbir yar oo ula kac ah ayaa lagu celiyaa ilaa cabbirka baakidhku uu noqdo mid aad u yar. Kadib qaataha ayaa daaha ka qaadaya cabbirka daaqada ee dhabta ah. Geedi socodka oo dhami wuu ku soo noqnoqonayaa ilaa isgaarsiintu ka dhammaato.

In kasta oo laga yaabo in aan si is beddel ah u isticmaalay ereyada daaqadda iyo kaydinta. Uma jeedo wax farqi ah oo u dhexeeya. Daraasadaha SWS , bakhaarradu waa daaqadda.

What is Silly Window Syndrome - Explanation and Prevention

Data is transferred over the network and Internet using the TCP/IP Protocol. The TCP/IP is not perfect but is easier to implement compared to other protocols theorized for data communication… such as the ISO OSI model. As with any technical thing, TCP/IP has some flaws too and Silly Window Syndrome is a creation of one of those flaws. To understand what is Silly Window Syndrome or SWS, you will first need to understand the underlying mechanism of data communication in TCP/IP.

Silly Window Syndrome

Understanding the window and its size

When two points are communicating under TCP/IP, it involves an acknowledging mechanism. This acknowledging mechanism is what causes Silly Window Syndrome as explained further. Points may refer to two computers, client and server, etc.

SWS is caused by the receiver advancing the right window edge whenever it has any new buffer space available to receive data and by the sender using any incremental window, no matter how small, to send more data. The result can be a stable pattern of sending tiny data segments, even though both sender and receiver have a large total buffer space for the connection, says MSDN.

When a computer, say A, sends a data packet to another computer B, the latter has to acknowledge and reply that it received the data packet. Along with the acknowledgment, it also has to send the size of buffer set apart for that communication thread. This is generally the number of bytes set free for communication.

So when B says 100B is available for the next message, the 100B is the window in Silly Window Syndrome. That is, it is the buffer size. With its own flaw, the TCP/IP mechanism may reduce the buffer size for each communication/data coming from A. That is, whenever A sends a message, B assumes the buffer size is reduced and sends a smaller number. Thus the window size keeps on reduced and at a point, the communication just stops as B sends 0B as the window size.

How Does Silly Window Syndrome Work

According to the above example of A and B, if B sends 1000B as window size, A will split it into two 500B and send two packets of 500B. Upon receipt of the first packet, B will send an acknowledgment saying 500B is available for the window as the second packet is yet to be received. A assumes 500B is the window size and sends two packets of 250B consequently. While at B, 500B is used and 500 is just received, it will send 0B as available. At this point, A will assume no window is available though it might happen that buffer is empty as the processor used up the data there. A will still send a smaller packet to see if any window is available. If the contents of the buffer at B are not yet removed, it will still receive 0 as response/acknowledgment.

Thus, the window size keeps on reducing as B sends acknowledgment every time it receives a packet from A. This size is usually smaller than the previous acknowledgment as B is receiving data packets in parts. There would be no problem if A could send a packet big enough to cover the buffer size on B at a time. But that it would require additional mechanisms and hence Silly Window Syndrome. The communication stops after A receives 0 two or three times.

How to prevent Silly Window Syndrome (SWS)

There is a simple algorithm to be implemented to get rid of SWS. Upon receiving the initial packet, B sends half the really available space as the window. That will make A send smaller packets. Consequently, when the packets become too smaller, then B sends the total buffer size so that A can start sending bigger data bytes again.

In other words, if 1000B is available, B sends 500B as acknowledgment. Accordingly, A sends 250B x 2 packets. For this, A receives 100B as acknowledgment. When it receives 50B packet, B sends 1000B – 50B to A. That makes the entire conversation operational again. This might induce a little delay in processing but will prevent Silly Window Syndrome from occurring and stopping the entire conversation.

To sum up, SWS is based on the buffer size available to the recipient and the assumed size calculated by the sender. To prevent SWS, a delay is introduced and a deliberate smaller window size is reciprocated until packet size becomes too small. Then the recipient discloses actually available window size. The entire process keeps on repeating until the communication is complete.

Although I may have used the words window and buffer interchangeably. I do not mean any difference between them. In SWS studies, the buffer is the window.

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