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Date:      Tue, 25 Feb 2020 23:59:04 +0100
From:      Mateusz Guzik <mjguzik@gmail.com>
To:        "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
Cc:        Hiroki Sato <hrs@freebsd.org>, micchie.gml@gmail.com, hackers@freebsd.org
Subject:   Re: Slow PXE boot
Message-ID:  <CAGudoHGv8OKH%2BM62QnHwNw0bOSCfiLzQm6yQLJJwTbMCdrZ%2B%2BQ@mail.gmail.com>
In-Reply-To: <79AD3725-FDCC-4045-A620-EDB25D88FA65@lists.zabbadoz.net>
References:  <20200224032300.00006290@gmail.com> <8F7B8958-5295-4A26-82E9-94C7A62ED8A1@longcount.org> <CA%2BSc9E0NNi8ViwXCn-Hif2_RQOnu11RLEMRUT2kOAaouLNySvQ@mail.gmail.com> <20200226.055717.1795667435522458112.hrs@FreeBSD.org> <15F7FD1E-3957-4D9E-922F-394D50445BA8@lists.zabbadoz.net> <79AD3725-FDCC-4045-A620-EDB25D88FA65@lists.zabbadoz.net>

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If memory serves the slowdown occured past the rewrite, so bisecting
wont get you far. I don't know what the difference is internally
though.

On 2/25/20, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> wrote:
> On 25 Feb 2020, at 21:02, Bjoern A. Zeeb wrote:
>
>> On 25 Feb 2020, at 20:57, Hiroki Sato wrote:
>>
>> Hi,
>>
>>> Michio Honda <micchie.gml@gmail.com> wrote
>>>   in
>>> <CA+Sc9E0NNi8ViwXCn-Hif2_RQOnu11RLEMRUT2kOAaouLNySvQ@mail.gmail.com>:
>>>
>>> mi> Hi,
>>> mi>
>>> mi> I had a similar problem before, and the solution was the use of
>>> pxeboot
>>> mi> file taken from FreeBSD 10 as suggested by Hiroki.
>>>
>>>  I could not reproduce this by using my boxes after all, but
>>> replacing
>>>  pxeboot with the older one was useful to gain the normal speed at
>>>  that time probably because of difference between new (11 or later)
>>>  loader's nfs client and the old one.  It was a problem sending a lot
>>>  of duplicated packets for some reason, not just a matter of the
>>>  buffer size.  And the server side was Linux.
>>>
>>>  Have anyone else also experienced this kind of very slow PXE
>>> booting?
>>>  It may be specific to using a Linux NFS server.
>>
>> I see it on zoo all day long for ages.  I=E2=80=99ll go back and try an =
old
>> pxeboot; if that really speeds things up massively I might even be
>> willing to debug this a bit more.
>
> I found a pxeboot from FreeBSD 7 and while it did not entirely work the
> kernel was loaded in seconds rather than minutes (felt).
>
> I guess it=E2=80=99s time to dig into the changes from back then..
>
> /bz
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--=20
Mateusz Guzik <mjguzik gmail.com>



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