-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 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 -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBCAAGBQJXfWUsAAoJEBzwKT+lPKRYj6sQAK1aBF/wO/CuS6QSgIH1HFiO r29An9vcXYBU+axOgMvwfewo1wpvYjSm6PL49Twivn84xQn4B+a+jtIj826OoyUg QblP4jEI/kiephVX3PXOhUye9ECFv44IiKcTAcUIXAFiSDKOQxRtPNHZxAmFkbT5 rucfaKSge87Hx10UtnccMgRbpezl/xylty+aI/QKdEaLFhnyYt8s9LtbDiEnqjtW p4mOw6yQ/6i+ajSQ+1r+M2/ZUqlDwmUf/nUeCemVB2kYOj99mU6lbWPr1+nIbvh7 CVbKQCW2Jx6dKfMLNmdnXM6C3oPQ7H3D1IA/MkmnHpIdKKm+iBsYOFIirA7QLx2o HthzsNi6cFBWCy2QlUhy1VvAsFC/uJKqQXPOEI2Em84o6Cx2n+WDQDP7T0GAwx+u DCLxqabhxRBCR63ZBNwzi3chB/5bfG8b8x+17VL9wFCUpjhw2mSOML0CH+a+0Y9W mR/h5d7/qLtnmVlB48PGAs7IYILHxuaQp1LCtXN48W9CP00G/W8T0Kqeuo2mXg72 WQ1sMxbXSwCyiYN1GTcRC8blhR6wS3ytQ0ol6mDHAq1sLMMnumOYuLJxlIa/mJPU KP3e0yvuMX73WHhQ5OOKmpzWSiwEM8apMtUti8IqXmv/+YOqyOypLc1hO6ryefYI TPPzcVJ7j3sPbjkZfjOr =uzQu -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
