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From: hiro <23hiro@gmail.com>
To: 9fans <9fans@9fans.net>
Subject: Re: [9fans] 9p server to multiply 9p messages?
Date: Tue, 31 May 2022 20:27:52 +0200	[thread overview]
Message-ID: <CAFSF3XPN46dqnKKomAEu7kgqntTUN2ErNdu=L70zwUe5GS=buA@mail.gmail.com> (raw)
In-Reply-To: <CAP6exYJFJJ8EpLKXy4ZNEmtjLiQXxPPEg8NuRODUz=Gep30FVw@mail.gmail.com>

so virtiofs is not using 9p any more?

and with 10 million parallel requests, why shouldn't 9p be able to
deliver 10GB/s ?!

On 5/31/22, ron minnich <rminnich@gmail.com> wrote:
> On Mon, May 30, 2022 at 12:21 AM Bakul Shah <bakul@iitbombay.org> wrote:
>> 9p itself is low performance but that is a separate issue.
> 
> Bakul, what are the units? It might be helpful to quantify this
> statement. Are you possibly conflating Plan 9 file systems being slow
> and 9p being slow?
> 
> As Rob pointed out in 2013, "If go install is slow on Plan 9, it's
> because Plan 9's file system is
> slow (which it is and always has been)", so slowness in Plan 9 file
> systems is to be expected.
> 
> 9p itself does have its limits, which is why Bell Labs Antwerp started
> an effort in 2011 to replace it, but the new work never went very far.
> 
> I also know of a number of efforts in the virtualization world where
> 9p was discarded for performance reasons. It's hard to argue with the
> 100x performance improvement that comes with virtiofs, for example.
> 
> Gvisor is replacing 9p: https://github.com/google/gvisor/milestone/6.
> Although, in the latter case, I would argue the problem is more with
> Linux limitations than 9p limitations -- linux can't seem to walk more
> than one pathname component at a time, for example, since it has the
> old school namei loop.
> 
> But I'm wondering if you have a measurement with numbers.
> 
> For rough order of magnitude, HPC file systems can deliver 10 Gbytes/
> second for file reads nowadays, but getting there took 20 years of
> work. When we ran Plan 9 on Blue Gene, with the 6 Gbyte/second
> toroidal mesh connect for each node, we never came remotely close to
> that figure.

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  reply	other threads:[~2022-05-31 18:28 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-28 16:02 fgergo
2022-05-28 18:43 ` Skip Tavakkolian
2022-05-28 19:21   ` ron minnich
2022-05-29 10:33     ` fgergo
2022-05-29 10:23   ` fgergo
2022-05-29 11:41     ` fgergo
2022-05-29 23:16 ` Bakul Shah
2022-05-30  4:59   ` ori
2022-05-30  7:19     ` Bakul Shah
2022-05-30  8:03       ` fgergo
2022-05-30  8:35       ` hiro
2022-05-31 16:14       ` ron minnich
2022-05-31 18:27         ` hiro [this message]
2022-05-31 18:35           ` ori
2022-06-01 12:00           ` ron minnich
2022-06-01 14:51             ` ori
2022-06-01 15:31             ` hiro
2022-06-01 15:39               ` hiro
2022-06-01 16:01             ` ori
2022-06-01  4:26         ` Bakul Shah
2022-06-01  7:25           ` hiro
2022-06-01 15:55           ` Jacob Moody
2022-06-01 17:56             ` Steve Simon
2022-06-01 22:29               ` hiro
2022-05-30  8:33     ` hiro

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