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From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
To: Eli Cohen <eli-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
Cc: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>,
	Chris Moore <Chris.Moore-laKkSmNT4hbQT0dZR+AlfA@public.gmane.org>,
	"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Nicholas A. Bellinger"
	<nab-IzHhD5pYlfBP7FQvKIMDCQ@public.gmane.org>
Subject: Re: Can someone help me understand the reason for this code in ib_isert.c?
Date: Tue, 28 Oct 2014 12:06:06 +0200	[thread overview]
Message-ID: <544F6A8E.9000400@mellanox.com> (raw)
In-Reply-To: <20141026140808.GA742@mtldesk30>

On 10/26/2014 4:08 PM, Eli Cohen wrote:
> On Sun, Oct 26, 2014 at 01:57:33PM +0100, Bart Van Assche wrote:
>> Applications really need a way to query what the maximum supported
>> number of scatter/gather entries per work request is. The current
>> approach, namely using "dev_attr.max_sge - <magic value>" is
>> cumbersome since this approach doesn't work if the value of max_sge
>> reported by the HCA is small. I see two possible solutions: either
>> modify the max_sge value reported by the mlx4 and mlx5 drivers or
>> introduce a new parameter in struct ib_device_attr.
>>
> we already have reported max_sge value. Maybe what we need is another
> field, "guarnateed_num_sge" so applicatios providing this value can be
> sure it would succeed (or there is some other problem). Then they can
> either use this value or iterate from max_sge down to
> guarnateed_num_sge to find the highest possible value.
>
Eli, can we be a bit more restrictive and report something which would 
work?
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  reply	other threads:[~2014-10-28 10:06 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-10-20 15:29 Can someone help me understand the reason for this code in ib_isert.c? Chris Moore
     [not found] ` <462EF229174FDB4D92ACE4656EA5610051E2EEF9-DWYeeINJQrxExQ8dmkPuX0M9+F4ksjoh@public.gmane.org>
2014-10-20 21:13   ` Or Gerlitz
     [not found]     ` <CAJ3xEMjmmt1guJO8rF6ChnTq-ZQbt9dpb_hwsNQCR65C79waRQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-10-22  5:06       ` Nicholas A. Bellinger
     [not found]         ` <1413954397.30983.33.camel-XoQW25Eq2zviZyQQd+hFbcojREIfoBdhmpATvIKMPHk@public.gmane.org>
2014-10-22  9:02           ` Or Gerlitz
2014-10-22 21:50             ` Nicholas A. Bellinger
2014-10-29 18:05               ` Chris Moore
     [not found]                 ` <462EF229174FDB4D92ACE4656EA5610051E396BE-DWYeeINJQrxExQ8dmkPuX0M9+F4ksjoh@public.gmane.org>
2014-10-30  8:24                   ` Sagi Grimberg
2014-10-30 15:06                     ` Chris Moore
2014-10-22 11:39           ` Sagi Grimberg
2014-10-23  7:43       ` Eli Cohen
2014-10-26 12:57         ` Bart Van Assche
     [not found]           ` <544CEFBD.2090405-HInyCGIudOg@public.gmane.org>
2014-10-26 14:08             ` Eli Cohen
2014-10-28 10:06               ` Or Gerlitz [this message]
     [not found]                 ` <544F6A8E.9000400-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2014-10-28 10:55                   ` Eli Cohen

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