sorry for the spam, but i just realized the cause of the behavior i was
seeing-- the cookie being set. after i modified the default vcl to:
# if (req.http.Authenticate || req.http.Cookie) {
if (req.http.Authenticate) {
pass;
}
it works as expected...
-mike
On Mon, Jul 02, 2007 at 11:22:01AM -0700, Mike Hedlund <[EMAIL PROTECTED]>
wrote:
> Hey guys,
>
> I've been playing with varnish for the last few days, trying to eval it
> as a squid replacement my image serving farm. I enabled it on one of the
> squids friday (replacing 2 seperate squid processes on a single server), and
> seen pretty awesome results:
>
> http://boom.net/~mike/squid_vs_varnish.GIF
>
> However, the load on my backend NFS server went up by a substantial amount. I
> let it run over the weekend thinking it would smooth out once the caches were
> primed, but to my dismay, this morning nfs load was still the same. After
> doing some basic debugging, it appears as if the (default) varnish config is
> always re-validating if-modified-since headers (when supplied by the client),
> thus bypassing the local cache and hitting the origin server again. My cache
> objects *never* change, so if a client supplies an if-modified-since header,
> I'd like the cache to always respond '304 not modified' immediately. I've
> configured squid to do this, but my vcl-fu is very weak. Before I spent more
> time investigating the VCL config options, I just wanted a sanity check to
> make sure it was possible to do this in varnish. At the bottom of this
> message i've included a small sample of a log file i generated this morning,
> I could be misreading it completely. Thanks!
>
>
> ps: the above load graph is from an image server in my production pool, that
> was spitting out around 150Mb/s of images at the time.
>
> -mike
>
>
>
>
> 11 SessionOpen c 10.1.1.9 33194
> 11 ReqStart c 10.1.1.9 33194 249494004
> 11 RxRequest c GET
> 11 RxURL c /85/40/458/tn_4096253716.jpg
> 11 RxProtocol c HTTP/1.1
> 11 RxHeader c Accept: */*
> 11 RxHeader c Accept-Language: en-us
> 11 RxHeader c Accept-Encoding: gzip, deflate
> 11 RxHeader c If-Modified-Since: Thu, 23 Feb 2006 00:02:51 GMT
> 11 RxHeader c If-None-Match: "13c02df-b23-40d6af72600c0"
> 11 RxHeader c User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
> NT 5.1; SV1)
> 11 RxHeader c Host: a.pc.xyz.com:87
> 11 RxHeader c Connection: Keep-Alive
> 11 VCL_call c recv
> 11 VCL_return c pass
> 11 VCL_call c pass
> 11 VCL_return c pass
> 14 BackendClose default
> 14 BackendOpen b default 127.0.0.1 33977 127.0.0.1 81
> 14 BackendXID b 249494004
> 11 Backend c 14 default
> 14 TxRequest b GET
> 14 TxURL b /85/40/458/tn_4096253716.jpg
> 14 TxProtocol b HTTP/1.1
> 14 TxHeader b Accept: */*
> 14 TxHeader b Accept-Language: en-us
> 14 TxHeader b Accept-Encoding: gzip, deflate
> 14 TxHeader b User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
> NT 5.1; SV1)
> 14 TxHeader b Host: a.pc.xyz.com:87
> 14 TxHeader b X-Varnish: 249494004
> 14 TxHeader b X-Forwarded-for: 10.1.1.9
> 14 RxProtocol b HTTP/1.1
> 14 RxStatus b 200
> 14 RxResponse b OK
> 14 RxHeader b Date: Mon, 02 Jul 2007 17:59:03 GMT
> 14 RxHeader b Server: Apache
> 14 RxHeader b Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 14 RxHeader b ETag: "13c02df-b23-40d6af72600c0"
> 14 RxHeader b Accept-Ranges: bytes
> 14 RxHeader b Content-Length: 2851
> 14 RxHeader b Content-Type: image/jpeg
> 11 ObjProtocol c HTTP/1.1
> 11 ObjStatus c 200
> 11 ObjResponse c OK
> 11 ObjHeader c Date: Mon, 02 Jul 2007 17:59:03 GMT
> 11 ObjHeader c Server: Apache
> 11 ObjHeader c Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 11 ObjHeader c ETag: "13c02df-b23-40d6af72600c0"
> 11 ObjHeader c Content-Type: image/jpeg
> 11 ObjHeader c Content-Length: 2851
> 14 BackendReuse b default
> 11 TTL c 249494004 RFC 3600 1183399143 1183399143 0 0 0
> 11 VCL_call c fetch
> 11 VCL_return c insert
> 11 Length c 0
> 11 TxProtocol c HTTP/1.1
> 11 TxStatus c 304
> 11 TxResponse c Not Modified
> 11 TxHeader c Date: Mon, 02 Jul 2007 17:59:03 GMT
> 11 TxHeader c Via: 1.1 varnish
> 11 TxHeader c X-Varnish: 249494004
> 11 TxHeader c Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 11 ReqEnd c 249494004 1183399143.654401000 1183399143.656763000
> 0.000043000 0.002308000 0.000054000
> 0 StatAddr 10.1.1.9 0 579 116 68 0 0 13 18505 6270
> 11 SessionOpen c 10.1.1.9 61746
> 11 ReqStart c 10.1.1.9 61746 249494005
> 11 RxRequest c GET
> 11 RxURL c /85/40/458/tn_4096253716.jpg
> 11 RxProtocol c HTTP/1.1
> 11 RxHeader c Accept: */*
> 11 RxHeader c Accept-Language: en-us
> 11 RxHeader c Accept-Encoding: gzip, deflate
> 11 RxHeader c If-Modified-Since: Thu, 23 Feb 2006 00:02:51 GMT
> 11 RxHeader c If-None-Match: "13c02df-b23-40d6af72600c0"
> 11 RxHeader c User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
> NT 5.1; SV1)
> 11 RxHeader c Host: a.pc.xyz.com:87
> 11 RxHeader c Connection: Keep-Alive
> 11 VCL_call c recv
> 11 VCL_return c pass
> 11 VCL_call c pass
> 11 VCL_return c pass
> 14 BackendClose b default
> 14 BackendOpen b default 127.0.0.1 33978 127.0.0.1 81
> 14 BackendXID b 249494005
> 11 Backend c 14 default
> 14 TxRequest b GET
> 14 TxURL b /85/40/458/tn_4096253716.jpg
> 14 TxProtocol b HTTP/1.1
> 14 TxHeader b Accept: */*
> 14 TxHeader b Accept-Language: en-us
> 14 TxHeader b Accept-Encoding: gzip, deflate
> 14 TxHeader b User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows
> NT 5.1; SV1)
> 14 TxHeader b Host: a.pc.xyz.com:87
> 14 TxHeader b X-Varnish: 249494005
> 14 TxHeader b X-Forwarded-for: 10.1.1.9
> 14 RxProtocol b HTTP/1.1
> 14 RxStatus b 200
> 14 RxResponse b OK
> 14 RxHeader b Date: Mon, 02 Jul 2007 17:59:21 GMT
> 14 RxHeader b Server: Apache
> 14 RxHeader b Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 14 RxHeader b ETag: "13c02df-b23-40d6af72600c0"
> 14 RxHeader b Accept-Ranges: bytes
> 14 RxHeader b Content-Length: 2851
> 14 RxHeader b Content-Type: image/jpeg
> 11 ObjProtocol c HTTP/1.1
> 11 ObjStatus c 200
> 11 ObjResponse c OK
> 11 ObjHeader c Date: Mon, 02 Jul 2007 17:59:21 GMT
> 11 ObjHeader c Server: Apache
> 11 ObjHeader c Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 11 ObjHeader c ETag: "13c02df-b23-40d6af72600c0"
> 11 ObjHeader c Content-Type: image/jpeg
> 11 ObjHeader c Content-Length: 2851
> 14 BackendReuse b default
> 11 TTL c 249494005 RFC 3600 1183399161 1183399161 0 0 0
> 11 VCL_call c fetch
> 11 VCL_return c insert
> 11 Length c 0
> 11 TxProtocol c HTTP/1.1
> 11 TxStatus c 304
> 11 TxResponse c Not Modified
> 11 TxHeader c Date: Mon, 02 Jul 2007 17:59:21 GMT
> 11 TxHeader c Via: 1.1 varnish
> 11 TxHeader c X-Varnish: 249494005
> 11 TxHeader c Last-Modified: Thu, 23 Feb 2006 00:02:51 GMT
> 11 ReqEnd c 249494005 1183399161.148634000 1183399161.149295000
> 0.000041000 0.000607000 0.000054000
> 0 StatAddr 10.1.1.9 0 597 117 69 0 0 14 18657 6270
>
>
>
>
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