tree 9cf2ea8bcfb5ee1170f4055979a69a0cd4266ab9
parent f042e6f95bb7dc771bf79f309dbdf0b34da933da
author Lorenz Brun <lorenz@nexantic.com> 1594904810 +0200
committer Lorenz Brun <lorenz@nexantic.com> 1594904810 +0200

Increase zeroing performance for data partition

It's possible to increase queue depth for O_DIRECT in simple cases like ours by just
submitting bigger buffers. As long as they are an exact multiple of the block size this is fine
and the kernel doesn't complain. This also enables O_SYNC to prevent any buffering on the guest.
This should help to push out data quicker and prevent buffer bloat. The host has its own cache
anyways.

Test Plan:
No change in functionality, I observe more predictable performance (previously
I sometimes had stalls where the initialization would take > 60s).

X-Origin-Diff: phab/D599
GitOrigin-RevId: 19554fd9e6d709bde738d01a0d2de190c441640e