linux-kernel - Re: [NFS] [PATCH 008 of 11] knfsd: Prepare knfsd for support of rsize/wsize of up to 1MB, over TCP.

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Message-ID: <20061003080202.GM28796@sgi.com>
Date:	Tue, 3 Oct 2006 18:02:02 +1000
From:	Greg Banks <gnb@....com>
To:	Neil Brown <neilb@...e.de>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	nfs@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [NFS] [PATCH 008 of 11] knfsd: Prepare knfsd for support of	rsize/wsize of up to 1MB, over TCP.

On Tue, Oct 03, 2006 at 03:41:43PM +1000, Neil Brown wrote:
> Comments on the below?

Looks ok, except...

> @@ -57,7 +57,8 @@ struct svc_serv {
>  	struct svc_stat *	sv_stats;	/* RPC statistics */
>  	spinlock_t		sv_lock;
>  	unsigned int		sv_nrthreads;	/* # of server threads */
> -	unsigned int		sv_bufsz;	/* datagram buffer size */
> +	unsigned int		sv_max_payload;	/* datagram payload size */
> +	unsigned int		sv_max_mesg;	/* bufsz + 1 page for overheads */

Presumably the comment should read "max_payload + 1 page..." ?

> @@ -414,9 +415,11 @@ svc_init_buffer(struct svc_rqst *rqstp, 
>  	int pages;
>  	int arghi;
>  	
> -	if (size > RPCSVC_MAXPAYLOAD)
> -		size = RPCSVC_MAXPAYLOAD;
> -	pages = 2 + (size+ PAGE_SIZE -1) / PAGE_SIZE;
> +	if (size > RPCSVC_MAXPAYLOAD + PAGE_SIZE)
> +		size = RPCSVC_MAXPAYLOAD + PAGE_SIZE;
> +	pages = size + PAGE_SIZE; /* extra page as we hold both request and reply.
> +				   * We assume one is at most one page
> +				   */

Isn't there a divide by PAGE_SIZE missing here?  Looks
like we'll be allocating a *lot* of pages ;-)

Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
I don't speak for SGI.
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