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From: "Emilio G. Cota" <cota@braap.org>
To: "Philippe Mathieu-Daudé" <f4bug@amsat.org>
Cc: qemu-devel@nongnu.org, "Alex Bennée" <alex.bennee@linaro.org>,
	"Pranith Kumar" <bobby.prani@gmail.com>,
	"Richard Henderson" <richard.henderson@linaro.org>
Subject: Re: [Qemu-devel] [RFC 6/6] cputlb: dynamically resize TLBs based on use rate
Date: Mon, 8 Oct 2018 09:46:16 -0400	[thread overview]
Message-ID: <20181008134616.GA25450@flamenco> (raw)
In-Reply-To: <20181008014834.GA21299@flamenco>

On Sun, Oct 07, 2018 at 21:48:34 -0400, Emilio G. Cota wrote:
> - 70/40% use rate for growing/shrinking the TLB does not
>   seem a great choice, if one wants to avoid a pathological
>   case that can induce constant resizing. Imagine we got
>   exactly 70% use rate, and all TLB misses were compulsory
>   (i.e. a direct-mapped TLB would have not prevented a
            ^^^
>   single miss). We'd then double the TLB size:

I meant fully associative.

		E.

  reply	other threads:[~2018-10-08 14:00 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-06 21:45 [Qemu-devel] [RFC 0/6] Dynamic TLB sizing Emilio G. Cota
2018-10-06 21:45 ` [Qemu-devel] [RFC 1/6] (XXX) cputlb: separate MMU allocation + run-time sizing Emilio G. Cota
2018-10-08  1:47   ` Richard Henderson
2018-10-06 21:45 ` [Qemu-devel] [RFC 2/6] cputlb: do not evict invalid entries to the vtlb Emilio G. Cota
2018-10-08  2:09   ` Richard Henderson
2018-10-08 14:42     ` Emilio G. Cota
2018-10-08 19:46       ` Richard Henderson
2018-10-08 20:23         ` Emilio G. Cota
2018-10-06 21:45 ` [Qemu-devel] [RFC 3/6] cputlb: track TLB use rates Emilio G. Cota
2018-10-08  2:54   ` Richard Henderson
2018-10-06 21:45 ` [Qemu-devel] [RFC 4/6] tcg: define TCG_TARGET_TLB_MAX_INDEX_BITS Emilio G. Cota
2018-10-08  2:56   ` Richard Henderson
2018-10-06 21:45 ` [Qemu-devel] [RFC 5/6] cpu-defs: define MIN_CPU_TLB_SIZE Emilio G. Cota
2018-10-08  3:01   ` Richard Henderson
2018-10-06 21:45 ` [Qemu-devel] [RFC 6/6] cputlb: dynamically resize TLBs based on use rate Emilio G. Cota
2018-10-07 17:37   ` Philippe Mathieu-Daudé
2018-10-08  1:48     ` Emilio G. Cota
2018-10-08 13:46       ` Emilio G. Cota [this message]
2018-10-08  3:21   ` Richard Henderson

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