[ZODB-Dev] performance of chunked data over ZEO

[Andreas Jung]

Inside an application that stored large amounts of data in the ZODB as 
linked
structure (very similar to the Pdata magic in OFS.Image) I discovered that
the chunk size has a significant influcence on the performance.  Using a 
chunk
size of 16k (which is also the default in OFS.Image) I got the expected 
transfer
rate of about 2-3MB/second. Increasing the chunk size to 64K caused a 
performance
loss to about 100-150 KB/seconds. Any ideas why increasing the chunk size
causes such a dramatic performance loss?

Andreas