Messages in this thread | | | Date | Wed, 20 Mar 2002 15:25:04 -0700 | From | "Jeff V. Merkey" <> | Subject | Re: Putrid Elevator Behavior 2.4.18/19 |
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> > > Jens/Linux, > > > > > > The elevator code is malfunctioning in 2.4.18/19-pre when we start > > > reaching the upward limits with multiple 3Ware adapters > > > running together. We started seeing the problem when we went to > > > 64 K aligned writes with sustained > 200 MB/S writes to > > > multiple 3Ware adapters. > > > > > > We have verified that the 3Ware adapters are not holding the request > > > off, but that one of the requests is getting severely starved and > > > does not get posted to the 3Ware adapters until thousands of IOs > > > have gone before it. > > > > > > > This elevator starvation problem has been identified and a patch already > > merged into 2.4.19-pre2. > > > > Can you verify the affects it produces for your workload? > > I will comply. I tested with pre-3 patches and still saw this problem?? > Let me go and check the patches I applied to verify, I may not have > applied the correct patch. > > Jeff
I verified we were using a stock 2.4.18 kernel on the specific system without the pre-3 patches installed. We have been testing with the latest patches but not on this system. We will apply and retest and I will verify.
Jeff
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