From: Thomas Graf <tgraf@suug.ch>
To: Patrick McHardy <kaber@trash.net>
Cc: davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, paulmck@linux.vnet.ibm.com,
josh@joshtriplett.org, challa@noironetworks.com,
walpole@cs.pdx.edu, dev@openvswitch.org, tklauser@distanz.ch,
netfilter-devel@vger.kernel.org
Subject: Re: [PATCH net-next 3/3] nftables: Convert nft_hash to use generic rhashtable
Date: Fri, 1 Aug 2014 11:39:01 +0100 [thread overview]
Message-ID: <20140801103901.GC7331@casper.infradead.org> (raw)
In-Reply-To: <970429e5-2465-40f2-998b-b82dab3debe8@email.android.com>
On 08/01/14 at 11:17am, Patrick McHardy wrote:
> On 1. August 2014 09:52:00 GMT+01:00, Thomas Graf <tgraf@suug.ch> wrote:
> >If the set size is known in advance, the table is sized accordingly,
> >otherwise the table size will default to 64. This is a slight change
> >in behaviour as previously the default was 4 which eventually required
> >many expansion iterations.
>
> That's assuming a sufficient number of entries will be added. I think there
> will be many cases in nftables where the number will be lower. Since
> expansion is not very expansive this number was chosen very deliberately
> and I'd prefer to keep it.
>
> Other than that:
>
> Acked-by: Patrick McHardy <kaber@trash.net>
OK, I will change the nft_hash default size back to 4.
I think the expansion is more expensive than it looks though as we
are potentially calling synchronize_rcu() multiple times while
holding a mutex to protect from concurrent mutations.
next prev parent reply other threads:[~2014-08-01 10:39 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-01 8:51 [PATCH net-next v3 0/3] Lockless netlink_lookup() with new concurrent hash table Thomas Graf
2014-08-01 8:51 ` [PATCH net-next 1/3] lib: Resizable, Scalable, Concurrent Hash Table Thomas Graf
2014-08-01 10:01 ` Nikolay Aleksandrov
2014-08-01 10:33 ` Thomas Graf
2014-08-01 10:26 ` Patrick McHardy
2014-08-01 10:32 ` Thomas Graf
2014-08-01 8:51 ` [PATCH net-next 2/3] netlink: Convert netlink_lookup() to use RCU protected hash table Thomas Graf
2014-08-01 8:52 ` [PATCH net-next 3/3] nftables: Convert nft_hash to use generic rhashtable Thomas Graf
2014-08-01 10:17 ` Patrick McHardy
2014-08-01 10:39 ` Thomas Graf [this message]
2014-08-01 10:47 ` Patrick McHardy
-- strict thread matches above, loose matches on Subject: below --
2014-08-02 9:47 [PATCH net-next v5 0/3] Lockless netlink_lookup() with new concurrent hash table Thomas Graf
2014-08-02 9:47 ` [PATCH net-next 3/3] nftables: Convert nft_hash to use generic rhashtable Thomas Graf
2014-08-02 10:56 ` Nikolay Aleksandrov
2014-08-01 11:58 [PATCH net-next v4 0/3] Lockless netlink_lookup() with new concurrent hash table Thomas Graf
2014-08-01 11:58 ` [PATCH net-next 3/3] nftables: Convert nft_hash to use generic rhashtable Thomas Graf
2014-08-01 12:21 ` Nikolay Aleksandrov
2014-08-01 13:49 ` Thomas Graf
2014-08-01 14:12 ` Patrick McHardy
2014-08-01 14:51 ` Thomas Graf
2014-08-01 15:00 ` Patrick McHardy
2014-07-31 22:56 [PATCH v2 0/3 net-next] Lockless netlink_lookup() with new concurrent hash table Thomas Graf
2014-07-31 22:56 ` [PATCH net-next 3/3] nftables: Convert nft_hash to use generic rhashtable Thomas Graf
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