On Wed, Jun 16, 2010 at 12:05:21PM +0200, Graham Leggett wrote: > On 16 Jun 2010, at 10:45 AM, Joe Orton wrote: > > >>There is already mod_buffer in trunk. From reading the docs, it > >>should > >>be suitable for this purpose. Or is it missing some functionality? > > > >You can get many of the benefits of using a memory buffer in the > >output > >filter chain very cheaply by increasing SendBufferSize, without the > >extra overhead of an extra filter. > > This won't help you when you have many small file buckets, which is > what you get when you put a forest of mod_include directives into a > file. Each of the (in our worst case 500 or so) file buckets is > happily sent out using SENDFILE, one after the other, in tiny chunks > on the wire. This same problem can occur in any dynamic application > doing a lot of small writes.
The core output filter should coalesce "small" writes already and if it's not doing that effeciently that's a bug. Are the "tiny" files you were seeing getting sendfile()d out bigger than AP_MIN_SENDFILE_BYTES? That sounds like a case for bumping up AP_MIN_SENDFILE_BYTES. Regards, Joe
