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Sukadev Bhattiprolu says: ==================== ibmvnic: Reuse ltb, rx, tx pools It can take a long time to free and reallocate rx and tx pools and long term buffer (LTB) during each reset of the VNIC. This is specially true when the partition (LPAR) is heavily loaded and going through a Logical Partition Migration (LPM). The long drawn reset causes the LPAR to lose connectivity for extended periods of time and results in "RMC connection" errors and the LPM failing. What is worse is that during the LPM we could get a failover because of the lost connectivity. At that point, the vnic driver releases even the resources it has already allocated and starts over. As long as the resources we have already allocated are valid/applicable, we might as well hold on to them while trying to allocate the remaining resources. This patch set attempts to reuse the resources previously allocated as long as they are valid. It seems to vastly improve the time taken for the vnic reset and signficantly reduces the chances of getting the RMC connection errors. We do get still them occasionally, but appears to be for reasons other than memory allocation delays and those are still being investigated. If the backing devices for a vnic adapter are not "matched" (see "pool parameters" in patches 8 and 9) it is possible that we will still free all the resources and allocate them. If that becomes a common problem, we have to address it separately. Thanks to input and extensive testing from Brian King, Cris Forno, Dany Madden, Rick Lindsley. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
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