From: Herbert Xu <herbert@gondor.apana.org.au>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: linux-kernel@vger.kernel.org, Thomas Graf <tgraf@suug.ch>,
netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org,
maple-tree@lists.infradead.org, rcu@vger.kernel.org
Subject: Re: [PATCH 0/1] Rosebush, a new hash table
Date: Sat, 24 Feb 2024 08:20:50 +0800 [thread overview]
Message-ID: <Zdk2YgIoAGOEvcJi@gondor.apana.org.au> (raw)
In-Reply-To: <20240222203726.1101861-1-willy@infradead.org>
On Thu, Feb 22, 2024 at 08:37:23PM +0000, Matthew Wilcox (Oracle) wrote:
>
> Where I expect rosebush to shine is on dependent cache misses.
> I've assumed an average chain length of 10 for rhashtable in the above
> memory calculations. That means on average a lookup would take five cache
> misses that can't be speculated. Rosebush does a linear walk of 4-byte
Normally an rhashtable gets resized when it reaches 75% capacity
so the average chain length should always be one.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2024-02-24 0:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 20:37 [PATCH 0/1] Rosebush, a new hash table Matthew Wilcox (Oracle)
2024-02-22 20:37 ` [PATCH 1/1] rosebush: Add new data structure Matthew Wilcox (Oracle)
2024-02-25 6:38 ` Al Viro
2024-02-23 11:37 ` [PATCH 0/1] Rosebush, a new hash table Peng Zhang
2024-02-23 13:55 ` Jason A. Donenfeld
2024-02-23 18:40 ` Kent Overstreet
2024-02-24 0:20 ` Herbert Xu [this message]
2024-02-24 22:10 ` David Laight
2024-02-25 0:50 ` Herbert Xu
2024-02-25 3:20 ` Kent Overstreet
2024-02-25 3:18 ` Kent Overstreet
2024-02-25 5:01 ` Matthew Wilcox
2024-02-25 5:32 ` Herbert Xu
2024-02-25 5:51 ` Kent Overstreet
2024-02-25 5:53 ` Herbert Xu
2024-02-25 6:14 ` Kent Overstreet
2024-02-25 6:17 ` Herbert Xu
2024-02-25 14:47 ` David Laight
2024-02-25 21:48 ` Kent Overstreet
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