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891
2019 Apr 01
1
Readahead in the nbdkit curl plugin
...s
the read data, and extending the length of other read requests so
there is a higher chance they will prefetch data:
https://github.com/qemu/qemu/blob/230ce19814ecc6bff8edac3b5b86e7c82f422c6c/block/curl.c#L277
https://github.com/qemu/qemu/blob/230ce19814ecc6bff8edac3b5b86e7c82f422c6c/block/curl.c#L891
Oh and BTW in my testing we found that readahead was very important
for performance of virt-v2v! This is because vCenter is really slow
and we issue requests to vCenter serially, so avoiding long round
trips is vital. (Of course vCenter performance sucks and anyone with
any sense uses ‘virt-v2v...