linux-kernel - Re: [PATCH net-next v2 1/2] fs/crashdd: add API to collect hardware dump in second kernel

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Message-ID: <0d106ece-4669-389d-da30-63a630ca625c@mellanox.com>
Date:   Tue, 3 Apr 2018 08:43:27 +0300
From:   Alex Vesker <valex@...lanox.com>
To:     Jiri Pirko <jiri@...nulli.us>, Andrew Lunn <andrew@...n.ch>
CC:     Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>,
        <netdev@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <kexec@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <davem@...emloft.net>, <viro@...iv.linux.org.uk>,
        <ebiederm@...ssion.com>, <stephen@...workplumber.org>,
        <akpm@...ux-foundation.org>, <torvalds@...ux-foundation.org>,
        <ganeshgr@...lsio.com>, <nirranjan@...lsio.com>,
        <indranil@...lsio.com>
Subject: Re: [PATCH net-next v2 1/2] fs/crashdd: add API to collect hardware
 dump in second kernel



On 4/2/2018 12:12 PM, Jiri Pirko wrote:
> Fri, Mar 30, 2018 at 05:11:29PM CEST, andrew@...n.ch wrote:
>>> Please see:
>>> http://patchwork.ozlabs.org/project/netdev/list/?series=36524
>>>
>>> I bevieve that the solution in the patchset could be used for
>>> your usecase too.
>> Hi Jiri
>>
>> https://lkml.org/lkml/2018/3/20/436
>>
>> How well does this API work for a 2Gbyte snapshot?
> Ccing Alex who did the tests.

I didn't check the performance for such a large snapshot.
 From my measurement it takes 0.09s for 1 MB of data this means
about ~3m.
This can be tuned and improved since this is a socket application.

>>     Andrew