On Tue, May 17, 2011 at 8:43 PM, Venkateswararao Jujjuri (JV)
<address@hidden> wrote:
I sent comments on individual patches. This is turning out nice, many
of the PDU handlers are now straight-line code that can be followed
easily.
o Redesigned to use bh as per Stefan's suggestion.
This made the code very simple but is little less performant compared to V1.
Anthony suggested to go-in with cleaner code and design (This version) and
deal with the performance later.
Just to put in perspective:
Sequential Writes of creating 1GB files using ffsb
o Write size 8k
With bh: 66.9MB/sec
Without bh (marshalling routines): 74.9 MB/sec
o Write size 128k
With bh: 117MB/sec
Without bh (marshalling routines): 122MB/sec
It would be interesting to hack in a post-yield callback which is
invoked after yield transfers control back to the calling coroutine.
This avoids setting up a BH and notifying the iothread to invoke it.
I'm just suggesting this as an experiment to see if the BH mechanism
causes the performance degradation, not as a real solution.