On Sat, Dec 2, 2017 at 7:18 AM, Josh Poimboeuf wrote:
> On Thu, Nov 30, 2017 at 10:29:44PM -0800, Andy Lutomirski wrote:
>> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
>> index caf74a1bb3de..28f4e7553c26 100644
>> --- a/arch/x86/entry/entry_64.S
>> +++
On Sat, Dec 2, 2017 at 7:18 AM, Josh Poimboeuf wrote:
> On Thu, Nov 30, 2017 at 10:29:44PM -0800, Andy Lutomirski wrote:
>> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
>> index caf74a1bb3de..28f4e7553c26 100644
>> --- a/arch/x86/entry/entry_64.S
>> +++
On Thu, Nov 30, 2017 at 10:29:44PM -0800, Andy Lutomirski wrote:
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index caf74a1bb3de..28f4e7553c26 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -180,14 +180,24 @@
On Thu, Nov 30, 2017 at 10:29:44PM -0800, Andy Lutomirski wrote:
> diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
> index caf74a1bb3de..28f4e7553c26 100644
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -180,14 +180,24 @@
This fixes a huge performance regression.
Please add to the changelog:
This patch actually seems to be a small speedup. With this patch,
SYSCALL touches an extra cache line and an extra virtual page, but
the pipeline no longer stalls waiting for SWAPGS. It seems that, at
least in a tight loop,
This fixes a huge performance regression.
Please add to the changelog:
This patch actually seems to be a small speedup. With this patch,
SYSCALL touches an extra cache line and an extra virtual page, but
the pipeline no longer stalls waiting for SWAPGS. It seems that, at
least in a tight loop,
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