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List: linux-sctp
Subject: Re: crc32c_intel vs libcrc32c
From: Vlad Yasevich <vyasevich () gmail ! com>
Date: 2012-05-31 17:23:27
Message-ID: 4FC7A90F.2000904 () gmail ! com
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On 05/31/2012 12:28 PM, Peter Butler wrote:
> I have a system with SSE4.2 and thus hardware support for CRC32C
> calculations. I can manually load the crc32c_intel module, however when I
> do an lsmod I see:
>
> [root@peterFC16 ~]# lsmod | grep -E 'crc|sctp'
> crc32c_intel 12770 0
> libcrc32c 12603 1 sctp
> sctp 203671 2
>
> Does this mean that SCTP is not actually using the crc32c_intel module? If
> so, how do I remedy that?
>
>
What happens if you don't manually load crc32c_intel? Does it still
show up in lsmod output?
I think you are already using it. libcrc32c doesn't do anything itself
any more. It's a wrapper that's calling the crypto api to compute the
checksum. Here it depends which crypto module it loads. It could load
crc32c_intel or it could load crc32c_generic. If you see intel loaded,
that's what you are using. If you see _generic loaded, then that's
what's available.
-vlad
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