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by masklinn 3392 days ago
So… it's not that the syscalls are slower, it's that the Linux-specific mechanism the Linux kernel uses to bypass having to actually perform these calls does not currently work on Xen (and thus EC2).
1 comments
yellowapple 3392 days ago
Depends on if you're looking at this from userspace or kernelspace. From the latter, you're spot on. From the former, the headline's spot on.
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masklinn 3392 days ago
> From the former, the headline's spot on.

Only if you're using Linux guests and assuming vDSO so not really. The headline made me first go to issues with the host/virtual hardware and some syscalls being much slower than normal across the board.

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