On Tue, 2008-04-22 at 16:47 -0500, Mike Christie wrote: <snip> > > wait > > ****************************************************** > > Simple Run: > > > > with patchset: 2.6.25-mm1: > > real 3m30.122s real 3m29.746s > > user 0m4.069s user 0m4.099s > > sys 0m14.876s sys 0m14.535s > > ----------------------------------------------- > > Is this just a boot up test or a test just running IO but no > failback/failover? Test running IO but no failover/failback. > > > > > Failover Run: > > > > with patchset: 2.6.25-mm1: > > real 5m18.875s real 5m31.741s > > user 0m4.069s user 0m3.883s > > sys 0m14.838s sys 0m13.822s > > Ehh, I have no idea if this is good or bad. Does it mean it is talking > 13 more seconds to complete? It is taking 13 more seconds without the serialization :) (i.e the old code). > > Have you seen the type of thread on dm-devel or the iscsi list where > people are concerned with getting the time the failure is detected to > the time IO is running on a new path down from something like 10 to 5 I totally agree with you that shaving a second here and a second there has lot of value to the customers. > > seconds. One time the iscsi driver did not implement time2wait correctly > and by fixing it we shaved only 2 seconds off and users were very happy > with the extra 2 seconds. We added the nop timer stuff so we could get > faster failovers. We have the fast io fail tmo so we can speed up the > process even more. Shaving off a second here or there is really nitpicky > and if I were you I would give me the middle finger :) It just seems But, I wouldn't :) > > like people expect better performance from this type of error. > > If my comment is too nitpicky then I am fine with ignoring this for now. > We just have to fix the emc short/long tress pass code then. I added > another EMC guy to the thread so he can ping the other EMC devs to get > going (I had sent them questions on how to handle it and have not got a > response). -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
