WebDAV/gluster very slow! Only 25MB/s upload

Hello,
I'm trying to figure out why my apache/mod_dav setup is so slow. I am able to SCP a file onto the box at 60MB/s, so I am surprised that webdav is so much slower. The 60MB/s is the max speed of gluster in my setup (I only have a 1gb link between the two nodes, so 1gbit/2 = 500mbit =~ 60mbytes). I see that cpu usage is considerably higher with webdav, and some quick write testing seems to correlate that apache is writing files with small block/stripe sizes.
For example using dd I can…
WebDAV/gluster very slow! Only 25MB/s upload

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