1. Allow the validator bootstrap code to specify the minimal snapshot download speed. If the snapshot download speed is detected below that, a different RPC can be retried. The default is 10MB/sec.
2. To prevent spinning on a number of sub-optimal choices and not making progress, the abort/retry logic is implemented with the following safe guards:
2.1 at maximum we do this retry for 5 times -- this number is configurable with default 5.
2.2 if the download in one notification round (5 second) is more than 2%, do not do retry -- it is not as bad anyway.
2.3 if the remaining estimate time is less than 1 minutes, do not abort retry as it will be done quickly anyway.
2.4 We do this abort/retry logic only at the first notification to avoid wasting download efforts -- the reasoning is being opportunistic and too greedy may not achieve overall shorter download time.
3. The download_snapshot and download_file is modified with the option allowing caller to notified of download progress via a callback. This allows the business logic of retrying to the place it belongs.
The new version of bpf-tools eliminates the separate
rust-bpf-sysroot. The Rust standard libraries for the BPF target are
built in tree when the compiler is built. The standard libraries code
is slightly more optimized and some reduction of compute budget can be
expected with this version of bpf-tools.
* Bump bpf-tools to version v1.3
This brings in the fix for increased compute budget that wasn't caught
when bpf-tools v1.2 were released.
* Adjust BPF test programs instruction counts
