Re: cache empties itself?
Ricardo Newbery wrote: > On Apr 7, 2008, at 5:22 PM, Michael S. Fischer wrote: > > >> Sure, but this is also the sort of content that can be cached back >> upstream using ordinary HTTP headers. >> > > > No, it cannot. Again, the use case is dynamically-generated content > that is subject to change at unpredictable intervals but which is > otherwise fairly "static" for some length of time, and where serving > stale content after a change is unacceptable. "Ordinary" HTTP headers > just don't solve that use case without unnecessary loading of the > backend. > Isn't this what if-modified-since requests are for? 304 not modified is a pretty small request/response, though I can understand the tendency to want to push it out to the frontend caches. I would think the management overhead of maintaining two seperate expirations wouldn't be worth the extra hassle just to save yourself some ims requests to a backend. Unless of course varnish doesn't support ims requests in a usable way, I haven't actually tested it myself. --Dave ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: cache empties itself?
On Apr 7, 2008, at 5:22 PM, Michael S. Fischer wrote: > On Fri, Apr 4, 2008 at 3:31 PM, Ricardo Newbery <[EMAIL PROTECTED] > > wrote: > Again, "static" content isn't only the stuff that is served from filesystems in the classic static web server scenario. There are plenty >> of "dynamic" applications that process content from database -- applying >> skins and compositing multiple elements into a single page while filtering >> every element or otherwise applying special processing based on a user's >> access privileges. An example of this is a dynamic content management system >> like Plone or Drupal. In many cases, these "dynamic" responses are fairly "static" for some period of time but there is still a definite >> performance hit, especially under load > >> In any case, both of these examples, Plone and Drupal, can indeed >> cache the >> output "locally" but that is still not as fast as placing a >> dedicated cache >> server in front. It's almost always faster to have a dedicated >> single-purpose process do something instead of cranking up the hefty >> machinery for requests that can be adequately served by the lighter >> process. > > Sure, but this is also the sort of content that can be cached back > upstream using ordinary HTTP headers. No, it cannot. Again, the use case is dynamically-generated content that is subject to change at unpredictable intervals but which is otherwise fairly "static" for some length of time, and where serving stale content after a change is unacceptable. "Ordinary" HTTP headers just don't solve that use case without unnecessary loading of the backend. > Still waiting for that compelling case that requires independent cache > configuration, This is an odd response. I've already pointed out at least one common use case which can benefit from "independent" cache configuration. Is that not compelling enough? It might help if you can explain your criteria for what qualifies as "compelling". Ric ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: cache empties itself?
On Fri, Apr 4, 2008 at 3:31 PM, Ricardo Newbery <[EMAIL PROTECTED]> wrote: > > > Again, "static" content isn't only the stuff that is served from > > > filesystems in the classic static web server scenario. There are plenty > of > > > "dynamic" applications that process content from database -- applying > skins > > > and compositing multiple elements into a single page while filtering > every > > > element or otherwise applying special processing based on a user's > access > > > privileges. An example of this is a dynamic content management system > like > > > Plone or Drupal. In many cases, these "dynamic" responses are fairly > > > "static" for some period of time but there is still a definite > performance > > > hit, especially under load > In any case, both of these examples, Plone and Drupal, can indeed cache the > output "locally" but that is still not as fast as placing a dedicated cache > server in front. It's almost always faster to have a dedicated > single-purpose process do something instead of cranking up the hefty > machinery for requests that can be adequately served by the lighter process. Sure, but this is also the sort of content that can be cached back upstream using ordinary HTTP headers. Still waiting for that compelling case that requires independent cache configuration, --Michael ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Varnish config/performance with Domino Webmail
Hi everyone,
I am setting up a new server that will sit into a DMZ to serve as a reverse
proxy for our company's Lotus Domino webmail. Having heard about Varnish, my
choice couldn't be something else.
I've set it up with the default configuration, but its performance showed to
be very, very poor. I've tried some tweaks to the VCL config file, but it
did not change. Performance is twice, tree times worst than directly
accesing the original server.
Machine is a HP server DL320 G5p, Xeon dual-core 2,66Ghz, 2GB RAM.
I would appreciate some directions on what to do.
Thank you,
Marcelo L.
ps. below is my changed VCL config file:
backend default {
set backend.host = "172.16.251.2";
set backend.port = "80";
}
sub vcl_recv {
if (req.request == "GET" && req.http.cookie) {
lookup;
}
}
sub vcl_fetch {
if (obj.http.Set-Cookie) {
insert;
}
}
sub vcl_fetch {
if (obj.ttl < 120s) {
set obj.ttl = 120s;
}
}
sub vcl_fetch {
remove obj.http.Set-Cookie;
}
sub vcl_recv {
if (req.request == "GET" && req.url ~ "\.(gif|jpg|swf|css|js).*") {
lookup;
}
}
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Re: recommendation for swap space?
On Mon, 7 Apr 2008, Michael S. Fischer wrote: > On Mon, Apr 7, 2008 at 2:14 PM, Simon Lyall <[EMAIL PROTECTED]> wrote: > > On Mon, 7 Apr 2008, Michael S. Fischer wrote: > > > That said, it wouldn't make sense to entirely deallocate your swap > > > space, since the kernel may decide to page or swap out processes other > > > than Varnish. > > > > and what is wrong with that? Surely your RAM is better being used by the > > main applications on the server ( Varnish ) rather than "sitting around > > and waiting" copies of sshd, cron and getty? > > Huh? Nothing I said contradicts that. Sorry, I read " wouldn't " as " would " [1] . [1] Approx 7 times. -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, Apr 7, 2008 at 2:14 PM, Simon Lyall <[EMAIL PROTECTED]> wrote: > On Mon, 7 Apr 2008, Michael S. Fischer wrote: > > That said, it wouldn't make sense to entirely deallocate your swap > > space, since the kernel may decide to page or swap out processes other > > than Varnish. > > and what is wrong with that? Surely your RAM is better being used by the > main applications on the server ( Varnish ) rather than "sitting around > and waiting" copies of sshd, cron and getty? Huh? Nothing I said contradicts that. --Michael ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, 7 Apr 2008, Michael S. Fischer wrote: > That said, it wouldn't make sense to entirely deallocate your swap > space, since the kernel may decide to page or swap out processes other > than Varnish. and what is wrong with that? Surely your RAM is better being used by the main applications on the server ( Varnish ) rather than "sitting around and waiting" copies of sshd, cron and getty? -- Simon J. Lyall | Very Busy | Web: http://www.darkmere.gen.nz/ "To stay awake all night adds a day to your life" - Stilgar | eMT. ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Multiple backends - Restarts - 1.1.2
Hi, I've just sucessfully configured Varnish 1.1.2. I have two webservers with identical content. If both servers are working, I do not care if the traffic is set to only one or to both. However, as and when one dies, I would like varnish to send traffic only to the working one! I notice the "Using restarts to try multiple backends" [1] in the Wiki, but it does not work for me. Even configuring more than one backend prevents varnish from starting. I've searched the mailing lists and there are references to this feature only being available in "trunk" versions. Does anyone have any information on when a branch that is stableish is likely to appear from this trunk? Many thanks, Alex [1] http://varnish.projects.linpro.no/wiki/VCLExampleRestarts ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: Management console
<[EMAIL PROTECTED]> writes: > Is it possible to use a password when connection the the management > console? Not currently. It wouldn't make much difference anyway, since the connection is unencrypted. I have plans to add support for binding the management interface to a Unix socket instead of a TCP socket, which will prevent sniffing and allow you to restrict access using regular file system permissions. > Why is it wierd line-breaks when connecting from windows telnet/putty > telnet to varnish management console? Because you didn't set it up to perform the required LF -> CR LF translation. DES -- Dag-Erling Smørgrav Senior Software Developer Linpro AS - www.linpro.no ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
On Mon, Apr 7, 2008 at 9:00 AM, Dag-Erling Smørgrav <[EMAIL PROTECTED]> wrote: > Sascha Ottolski <[EMAIL PROTECTED]> writes: > > now that my varnish processes start to reach the RAM size, I'm wondering > > what a dimension of swap would be wise? I currently have about 30 GB > > swap space for 32 GB RAM, but am wondering if it could even make sense > > to have no swap at all? My cache file is 517 GB in size. > > Varnish does not use swap. That said, it wouldn't make sense to entirely deallocate your swap space, since the kernel may decide to page or swap out processes other than Varnish. --Michael ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Re: recommendation for swap space?
Sascha Ottolski <[EMAIL PROTECTED]> writes: > now that my varnish processes start to reach the RAM size, I'm wondering > what a dimension of swap would be wise? I currently have about 30 GB > swap space for 32 GB RAM, but am wondering if it could even make sense > to have no swap at all? My cache file is 517 GB in size. Varnish does not use swap. DES -- Dag-Erling Smørgrav Senior Software Developer Linpro AS - www.linpro.no ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
Management console
Is it possible to use a password when connection the the management console? Why is it wierd line-breaks when connecting from windows telnet/putty telnet to varnish management console? Looks like this: discard vcl.list vcl.show param.show [-l] [] param. set url.purge hash.purge Thanks Erik ___ varnish-misc mailing list varnish-misc@projects.linpro.no http://projects.linpro.no/mailman/listinfo/varnish-misc
