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Date: Mon, 8 Jan 2018 12:00:28 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Linus Torvalds' <torvalds@...ux-foundation.org>, Willy Tarreau <w@....eu> CC: Alexei Starovoitov <alexei.starovoitov@...il.com>, Alan Cox <gnomes@...rguk.ukuu.org.uk>, Dan Williams <dan.j.williams@...el.com>, "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, Andi Kleen <ak@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Peter Zijlstra <peterz@...radead.org>, "Network Development" <netdev@...r.kernel.org>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de> Subject: RE: [PATCH 06/18] x86, barrier: stop speculation for failed access_ok From: Linus Torvalds > Sent: 07 January 2018 19:47 ... > Also, people definitely *are* noticing the performance issues with the > current set of patches, and they are causing real problems. Go search > for reports of Amazon AWS slowdowns. Try over 35% slowdown.... Given that AWS instance runs known code (user and kernel) why do we need to worry about any of these sideband attacks? David
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