linux-kernel - Re: [PATCH 1/3] IB/ehca: Replace vmalloc with kmalloc

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Message-ID: <49EF4201.9030606@evidence.eu.com>
Date:	Wed, 22 Apr 2009 18:12:49 +0200
From:	michael <michael@...dence.eu.com>
To:	Stefan Roscher <ossrosch@...ux.vnet.ibm.com>
CC:	Roland Dreier <rdreier@...co.com>, fenkes@...ibm.com,
	LKML <linux-kernel@...r.kernel.org>,
	OF-EWG <ewg@...ts.openfabrics.org>,
	LinuxPPC-Dev <linuxppc-dev@...abs.org>, raisch@...ibm.com,
	alexschm@...ibm.com, stefan.roscher@...ibm.com
Subject: Re: [PATCH 1/3] IB/ehca: Replace vmalloc with kmalloc

Hi,

Stefan Roscher wrote:
> On Wednesday 22 April 2009 04:10:18 pm michael wrote:
>   
>> Hi,
>>
>>     
>
>   
>> I don't take the point, if it is not import use the vmalloc. Why you try 
>> with a kmalloc
>> alloc first? and why do not use kzalloc?
>>     
>
> Because kmalloc() is faster than vmalloc() causing a huge performance win
> when someone allocates a large number of queue pairs. We fall back to
> vmalloc() only if kmalloc() can't deliver the memory chunk.
>   
Sorry I catch later the performace issue.
> We don't need kzalloc because we fill the list right after the alloc.
>
> regards Stefan
>   
Regards Michael
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...abs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
>
>   

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