if your requested URL is expires very often, then you may hit the read-while-writer performance issue, we have fixed that read-while-writer in V3.3 that will make it really work.
please compare the Origin Side traffic during the test. and you'd better try the compare without expire issue, to make sure we have not make critical regression there. thanks 在 2013-8-10，下午11:14，Reindl Harald <[email protected]> 写道： > > Am 10.08.2013 16:46, schrieb Leif Hedstrom: >> On Aug 10, 2013, at 7:21 AM, Reindl Harald <[email protected]> wrote: >> >>> has anybody compared 3.2 / 3.3 in performance? >>> >>> ab -c 200 -n 100000 http://<url>/rte/upload/logo.gif while "logo.gif" is >>> 643 bytes small and currently httpd without Trafficserver in front has >>> nearly the same perfomrance with even lower CPU >> >> I haven't seen this behavior. Are you positive the 3.3.5 results are cache >> hits ? And if so, that they become RAM cache hits? Just trying to get some >> ideas here … :) > > i hope so, if not that would be a bug > > [root@testserver:~]$ curl --head http://rhsoft.testserver/rte/upload/logo.gif > HTTP/1.1 200 OK > Date: Sat, 10 Aug 2013 15:09:31 GMT > Last-Modified: Tue, 11 Apr 2006 10:40:40 GMT > ETag: "283-411255ab33a00" > Accept-Ranges: bytes > Content-Length: 643 > Cache-Control: max-age=60 > Expires: Sat, 10 Aug 2013 15:10:31 GMT > X-Content-Type-Options: nosniff > Connection: close > Content-Type: image/gif > > on the origin mod_expires is in action to set 60 seconds > cache for images because in our case we have 100% dynamic > pages and the job of ATS is only hold back the image/css/js > requests from the preforking apache and offer KeepAlive > > the 60 seconds are reflected in the curl-repsonse abvove > which comes from the origin (127.0.0.1:80) > > <IfModule mod_expires.c> > ExpiresActive On > ExpiresByType image/jpeg A60 > ExpiresByType image/jpg A60 > ExpiresByType image/gif A60 > ExpiresByType image/png A60 > ExpiresByType text/css A60 > ExpiresByType text/html A60 > ExpiresByType text/javascript A60 > ExpiresByType text/comma-separated-values A60 > ExpiresByType text/tab-separated-values A60 > ExpiresByType application/javascript A60 > ExpiresByType application/x-javascript A60 > ExpiresByType application/xhtml+xml A60 > ExpiresByType application/xml A60 > <IfModule/> > > >> Reclaimable freelist would not have these sort of performance discrepancies > > yes, and it should not matter in a (ok small) cache with only a handful of > objects >
