PQ60569: A PROBLEM WITH THE 4.0 PLUGIN TRYING TO WRITE TOO LARGE A CHUNK OUT WHEN AFPA IS TURNED ON. | |||||||||||||||||||||||||||||||||||||
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APAR status Closed as program error. Error description Customer has found that the plugin is slowing performance on the Windows NT platform. This does not happen on AIX and has been isolated as a plugin issue because response is normal using the WebSphere embedded webserver. This appears to be a problem with the plugin trying to write too large a chunk out when AFPA is turned on.Local fix Customer has found that the plugin is slowing performance on the Windows NT platform. This does not happen on AIX and has been isolated as a plugin issue because response is normal using the WebSphere embedded webserver. This appears to be a problem with the plugin trying to write too a chunk out when AFPA is turned on.Problem summary **************************************************************** * USERS AFFECTED: WebSphere Application Server Version 4 users * * of the IBM Http Server plugin who are having * * large responses returned from the app server * * with a content length set. * **************************************************************** * PROBLEM DESCRIPTION: The plugin was suffering performance * * degradation when large responses were * * being returned from the app server with * * a content length set. * **************************************************************** * RECOMMENDATION: * **************************************************************** The plugin would buffer the full amount of content when a content length was set and then call write once with the big buffer. On Win32 this was a problem because when Afpa was enabled that big buffer would have to be allocated in the kernel memory.Problem conclusion When the plugin gets a large amount of content with the content length set it will now read a max of 64K at one time and then write the 64K. It will do this repeatedly until all the content is written out.Temporary fix Comments
APAR is sysrouted FROM one or more of the following: APAR is sysrouted TO one or more of the following: Modules/Macros
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Document Information |
Product categories: Software > Application Servers >
Distributed Application & Web Servers > WebSphere Application
Server > General
Operating system(s):
Software version: 400
Software edition:
Reference #: PQ60569
IBM Group: Software Group
Modified date: May 3, 2002
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