Tomorrow. Reviewing the qlogic net ones then have this on my todo. On Aug 12, 2013, at 5:00 PM, Or Gerlitz <[email protected]> wrote:
> On Thu, Aug 8, 2013 at 4:25 PM, Or Gerlitz <[email protected]> wrote: >> Replace the session lock with two locks, a "forward" lock and >> a "backwards" lock named frwd_lock and back_lock respectively. >> >> The forward lock protects resources that change while sending a >> request to the target, such as cmdsn, queued_cmdsn, and allocating >> task from the commands' pool with kfifo_out. >> >> The backward lock protects resources that change while processing >> a response or in error path, such as cmdsn_exp, cmdsn_max, and >> returning tasks to the commands' pool with kfifo_in. >> >> Under a "steady state" fast-path situation, that is when one >> or more processes/threads submit IO to an iscsi device and >> a single kernel upcall (e.g softirq) is dealing with processing >> of responses without errors, this patch eliminates the contention >> between the queuecommand()/request response/scsi_done() associated >> with iscsi sessions. >> >> Using this patch in an accelerated version of the iser initiator we were >> able to gain large improvements in IOPS rate in a situation where the burning >> bottle-neck was the session lock. > > Hi Mike and Co. > > Any feedback on this patch? > > Or. > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/groups/opt_out.
