Thanks Babu, I will fix the issues you pointed. Let me know how the testing goes. It will be nice if you could also review the code :) chandra On Wed, 2009-09-30 at 22:19 -0600, Moger, Babu wrote: > Hi Chandra, > Thanks for the patches. Patches applied cleanly on 2.6.31. I am testing the patches right now. Will post the with test results tomorrow. > These are my initial comments. > 1. Patches do not apply on 2.6.32. You may have to regenerate it on 2.6.32. > 2. Also, I noticed few errors and warnings while running checkpatch.pl script. > 3. Subject line for patch 3 and 4 may need to be modified. It still says "rdac handler". It should be hp and alua handler. > > Thanks.. > > > -----Original Message----- > > From: linux-scsi-owner@xxxxxxxxxxxxxxx [mailto:linux-scsi- > > owner@xxxxxxxxxxxxxxx] On Behalf Of Chandra Seetharaman > > Sent: Tuesday, September 29, 2009 9:08 PM > > To: linux-scsi@xxxxxxxxxxxxxxx > > Cc: dm-devel@xxxxxxxxxx; Moger, Babu; michaelc@xxxxxxxxxxx; > > Benoit_Arthur@xxxxxxx; Eddie.Williams@xxxxxxxxxxxx; > > berthiaume_wayne@xxxxxxx; Chandra Seetharaman > > Subject: [PATCH 0/4] scsi_dh: Make scsi_dh_activate asynchronous > > > > Hello All, > > > > Currently, device handlers process path activation in series. This leads > > to a lot of time delay when more than 100 luns are involved. For example, > > with lsi rdac 100+ luns take about 12-15 minutes. This was found by Moger > > Babu of LSI. > > > > This time delay can be avoided if we can do the activations > > asynchronously. > > By making scsi_dh_activate() async, we can give the device handlers an > > oppurtunity to decide on how to send the device activation down the wire > > to make the turn around time faster. They can send the commands > > asynchronously or send them in batches. > > > > I brought up this issue on the mailing list > > (http://marc.info/?l=linux-scsi&m=123888063818755&w=2) and provided a > > set of patch a loooong while back http://marc.info/?l=linux- > > scsi&m=124088712709821&w=2 > > > > This set of patches applies cleanly on 2.6.31 and I tested the rdac > > handler > > on the same. > > > > Please review and provide comments. > > > > This set of patched adds asynchronous support for rdac, hp, and alua > > handlers. > > > > Didn't add async support for EMC for the following reasons: > > - EMC handler is getting more hairy (when I try to move to _nowait()) > > - I do not know if EMC has a special command to group them (like rdac). > > - I wasn't sure if EMC has this problem in the first place ( I did not > > get > > any response from EMC). > > Can somebody from EMC comment, please. > > > > Thanks & Regards, > > > > chandra > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
