From: Richard Henderson <rth@twiddle.net>
To: "Peter Maydell" <peter.maydell@linaro.org>,
"Alex Bennée" <alex.bennee@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH v2 0/5] AArch64 TLB performance improvements
Date: Wed, 06 Aug 2014 10:32:10 -1000 [thread overview]
Message-ID: <53E290CA.4040204@twiddle.net> (raw)
In-Reply-To: <CAFEAcA_Bso1-Zmif3fEd+XNnCY1_URJopMJUWKMRhuxd8o0UrA@mail.gmail.com>
On 08/01/2014 12:26 PM, Peter Maydell wrote:
> So I think it would be good if we investigated the degree
> of difficulty in improving QEMU's TLB code so it isn't just
> "one TLB entry size with larger pages a bolt-on which we
> hope people don't actually use" first, before we just disable
> all the v5 CPUs.
I suspect the overhead of making the guest page size variable
will be less than the improvement that can be had in doing so.
Supporting multiple page sizes simultaneously, as with "huge pages", is
probably unfeasible.
r~
next prev parent reply other threads:[~2014-08-06 20:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-30 15:20 [Qemu-devel] [PATCH v2 0/5] AArch64 TLB performance improvements Alex Bennée
2014-07-30 15:20 ` [Qemu-devel] [PATCH v2 1/5] target-arm: don't hardcode mask values in arm_cpu_handle_mmu_fault Alex Bennée
2014-07-30 15:20 ` [Qemu-devel] [PATCH v2 2/5] target-arm: A64: fix TLB flush instructions Alex Bennée
2014-07-30 15:20 ` [Qemu-devel] [PATCH v2 3/5] target-arm: A64: fix use 12 bit page tables for AArch64 Alex Bennée
2014-07-30 15:20 ` [Qemu-devel] [PATCH v2 4/5] scripts/make_device_config.sh: inline includes Alex Bennée
2014-07-30 15:20 ` [Qemu-devel] [PATCH v2 5/5] target-arm: A64: disable a bunch of ARMv5 machines Alex Bennée
2014-08-01 16:45 ` Christopher Covington
2014-08-01 17:32 ` Peter Maydell
2014-08-01 16:06 ` [Qemu-devel] [PATCH v2 0/5] AArch64 TLB performance improvements Peter Maydell
2014-08-01 22:26 ` Peter Maydell
2014-08-04 10:23 ` Alex Bennée
2014-08-04 10:32 ` Peter Maydell
2014-08-04 13:11 ` Christopher Covington
2014-08-06 20:32 ` Richard Henderson [this message]
2014-08-01 19:35 ` Paolo Bonzini
2014-08-04 10:29 ` Alex Bennée
2014-08-04 11:34 ` Alex Bennée
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