this post was submitted on 15 Jul 2025
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@CoyoteFacts @bargu the biggest issue ... some distributions (cachyos for example) have such a new kernel which doesn't support fsync ( winesync ) and you want to use the newest kernel for modern amd gpu's ( eg.: 9070 xt) so downgrade to 6.11 ( last kernel with winesync ) is not a good choice.
Fsync hasn't been dropped from the kernel, 6.15 still supports it, this test was done on 6.15.
He may want to say "fastsync" (whose kernel part called winesync). It's the predecessor of NTsync and was renamed to NTsync when merged into linux mainline.
Before NTsync was merged, those distrobutions provides the kernel packages with winesync patches. Since linux 6.12, NTsync was merged so they droped winesync from kernel package. But NTsync's API is different with fastsync/winesync, so old wine with fastsync support will stop working with new kernel. (While NTsync still isn't merged to wine)
@Coelacanthus @bargu isn't protons fallback esync if winesync isn't available ? Wasn't it esync -> winesync (fastsync) -> ntsync ?