please unsubscribe. thanks
From: Christopher Schultz <ch...@christopherschultz.net>
To: Tomcat Users List <users@tomcat.apache.org>
Sent: Wednesday, July 6, 2016 3:08 PM
Subject: Re: poor upload performance with isapi_redirect.dll and IIS
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Andy,
On 7/6/16 4:05 PM, Wang, Andy wrote:
> On Fri, 2016-07-01 at 17:16 +0000, Wang, Andy wrote:
>> We're seeing some really poor performance with isapi_redirect.dll
>> and uploading files with IIS.
>>
>> In a particular example, using a 200MB file, the file upload
>> (POST) takes ~50 seconds on localhost.
>>
>> The same upload using Apache and mod_jk takes about ~6 seconds.
>>
>> The interesting thing is, on a remote client, the behavior is
>> almost the same. Upload to IIS takes ~50 seconds, upload to
>> apache/mod_jk takes ~7 seconds.
>>
>> I've done some wireshark captures have found some of the
>> differences.
>>
>> Apache streams to mod_jk as the upload is occurring.
>>
>> IIS appears to be buffering the entire upload before finally
>> streaming to tomcat via ajp. The TCP recieve window is regularly
>> being starved (ZeroWindow) and the client has to wait for a
>> window update before being able to send more. I'm not familiar
>> with ISAPI at all, so I don't know if the responsibility on the
>> buffering of the POST is an IIS issue, or is the isapi_redirect
>> filter the problem? Or is there some overall limitation with
>> isapi?
>>
>
> Apparently the site that was running into this problem had someone
> set uploadReadAheadSize to 2GB in IIS. That specifically controls
> the amount that IIS buffers before sending to isapi.
>
> So that was it. Dialing that back appears to have solved the
> issue.
Thanks for posting back. It's a good addition to the archives even
though nobody here ended up helping you :)
- -chris
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