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Subject: Re: About custom device counter
On Mon, Jun 12, 2023 at 02:12:35PM +0800, Xuan Zhuo wrote: > We hope to support device custom counter. That is, virtio spec provides a > channel for driver and device, and both key and value are provided by device. > > We discussed this issue earlier, and after some internal practice, I think it is > still necessary to discuss this again. > > It is very important, each cloud vendor will always have some special counters, > these counters may not exist in another vendor. At the same time, if we have > to discuss it in the spec every time we add a counter, or add a feature, I > think it is very inconvenient. Manufacturers may add some new counters at any > time based on some new requirements. Some counters may also be removed at any > time. > > Of course I know that doing this might hurt migration. But what I want to say is, > why does it affect live migration? These counters we plan to give to users > through ethtool -S, and some changes have taken place in the ethtool counters > output by users. Does this have any practical impact? Or do we directly use > some other output in a way, we can clearly tell the user that these counters > may change during the migration process. For example, the driver is migrated > to some new devices. These devices support some new counters. I think users > should be able to see these new counters. These new counters may be the > purpose of the migration. > > We don't need to support live migration at this point. > > Thanks. Why not just document the thing? -- MST
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