Please ignore this. Seems that I misinterpreted my test result. Actually Pipe performance is not that bad.
BR, Somsak [email protected] On Fri, Dec 7, 2012 at 4:58 PM, Somsak Sriprayoonsakul <[email protected]>wrote: > Hello, > > We were trying to use Varnish as L7 HTTP request router with absolutely NO > cache. > > We created very minimal VCL rules to select correct backend and return > PIPE for all requests. Below are the snippet taken from the VCL. > > sub vcl_recv { > # if X-Forwarded-For has been set by CDN, leave it > if (! req.http.X-Forwarded-For) { > set req.http.X-Forwarded-For = client.ip; > } > > if (req.http.host ~ "desired.domain.com" && > (req.request == "GET" && > ! ( (req.url ~ ".*\?.*[&]?.*") || > (req.url ~ ".*/$") || > (req.url ~ ".*/\?.*") || > (req.url ~ ".*\?.*[&]?upload.*") > )) > ) { > set req.backend = tier1; > } elsif (req.request == "PUT") { > set req.backend = tier2; > } elsif (req.http.host ~ "another.domain.com") { > set req.backend = tier_console; > } else { > set req.backend = default_tier; > } > return (pipe); > } > > sub vcl_pipe { > set bereq.http.connection = "close"; > > return (pipe); > } > > With this, Varnish work as expected, but however the performance is much > lower than in "lookup" mode. > > We tested performance by using Tsung, had 3 servers simulated 15000 > clients. Backends cosists of 2 servers running NGINX. We got the following > results. > > - Have TSUNG did the load balancing to 2 servers (TSUNG can do round-robin > load balance by itself). We got around 4500-4800 request/sec > - TSUNG point to Varnish with above VCL. request/sec drop to around > 900-1000 request/sec. > - If we change the last line to "return (lookup);" instead of "return > (pipe);", we got around 3300 request/sec. > > I tried to play around with thread_pool, thread_pool_min, and > thread_pool_max as suggested on various web sites. Even with -p > thread_pool_min=100, -p thread_pool_max=5000, -p thread_pools=8, -p > session_linger=50, -p cli_timeout=25, -p listen_depth=8192 the performance > didn't improve much (NOTE: Varnish server has 8 core) > > Is there anyway to increase performance of PIPE only mode to be, at the > least, in the same level as Lookup mode? What could we do to debug the > performance? > > Best Regards, > > Somsak > > [email protected] > >
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