It became obvious recently from one of the customer bugreports that if you disable readahead on the client, we default to one page per rpc on reads if readahead is disabled due to doing sync reads from ll_readpage.

It really should not be like this, since we are fully aware of the actual syscall read size request (due to an earlier ll_file_read call). Before clio we were doing the correct thing, but regressed in clio implementation.

This is not a terribly high prioriy since I don't see many valid reasons to run with readahead completely off, but its' still somewhing where we could be doing things more sensibly (and used to do as well).