VMware Workstation 7 Bedienungsanleitung PDF herunterladen (Seite 337)

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Chapter 16 Connecting Devices

11 (Optional)OntheHardwaretabofthevirtualmachinesettingseditor,toconfigure

thisserialporttousepolledmode,selectYield CPUonpoll.

Thisoptionisofinteresttodeveloperswhoareusingdebuggingtoolsthat

communicateoveraserialconnection.Iftheserialportintheguestisbeingused

inpo

lledmoderatherthaninte

rruptmode,youmightnoticeperformanceissues.

Thisoptionforcesthevirtualmachinetoyieldprocessortimeiftheonlytaskitis

tryingtodoispollthevirtualserialport.

Ifyouaresettingupaconnectionbetweentwovirtualmachines,younowhav

ethefirst

virtualmachinesetupastheserver.Repeatthisprocedureforthesecondvirtual

machine,butsetitupastheclientbyselectingThisendistheclientwhenconfiguring

thenamedpipe.

Change the Input Speed of the Serial Connection

Youcanincreasethespeedofaserialconnectionoverapipetoavirtualmachine.

Beforeyoubegin,usetheguestoperatingsystemtoconfiguretheserialportforthe

highestsettingsupportedbytheapplicationyouarerunninginthevirtualmachine.

Inprinciple,theoutputspeed,whichisthespeedatwhichthevirtualmach

inesends

datathroughthevirtualserialport,isunlimited.Inpractice,theoutputspeeddepends

onhowfasttheapplicationattheotherendofthepipereadsinbounddata.

To change the input speed of the serial connection

1PoweroffthevirtualmachineandclosetheWorkstationwindow.

2Useatexteditortoaddthefo

llowinglinetoyourvirtualmachine’sconfiguration

(.vmx)file:

serial<n>.pipe.charTimePercent = "<x>"

<n>isthenumberoftheserialport,startingfrom0.Thefirstserialportisserial0.

The<x>valueisapositiveintegerthatspecifiesthetimetakentotransmita

character,expressedasapercentageofthedefaultspeedsetfortheserialportin

theguest.Forexampl

e,asettingof200forcestheportto

taketwiceaslongforeach

character,orsenddataathalfthedefaultspeed.Asettingof50forcestheportto

takeonlyhalfaslongforeachcharacter,orsenddataattwicethedefaultspeed.

Assumingthattheseri

alportspeedissetappropriate

lyintheguestoperating

system,experimentwiththissetting.Startwithavalueof100andgradually

decreaseituntilyoufindthehighestspeedatwhichyourconnectionworks

reliably.

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