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From: Alkis Georgopoulos <alkisg@gmail.com>
To: Trond Myklebust <trondmy@gmail.com>,
	"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: rsize,wsize=1M causes severe lags in 10/100 Mbps
Date: Fri, 20 Sep 2019 13:04:43 +0300
Message-ID: <6fa596e9-b154-310e-9685-7663731618ba@gmail.com> (raw)
In-Reply-To: <1e7c9896-eb1b-9d7c-fff0-6df2b3d96392@gmail.com>

On 9/20/19 12:48 PM, Alkis Georgopoulos wrote:
> I did test the boot bandwidth (I mean how many MB were transferred).
> On ext4-over-NFS, with tmpfs-and-overlayfs to make root writable:


I also tested with the kernel netbooting default of rsize=4K to compare.
All on 100 Mbps, tcp,timeo=600:

| rsize | MB to boot | sec to boot |
|-------|------------|-------------|
|   1M  |    1250    |     84      |
|  32K  |     471    |     40      |
|   4K  |     320    |     31      |
|   2K  |     355    |     34      |

It appears matching rsize=cluster size=4K gives the best results.

Thank you,
Alkis Georgopoulos

  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-19  7:29 rsize,wsize=1M causes severe lags in 10/100 Mbps, what sets those defaults? Alkis Georgopoulos
2019-09-19 15:08 ` Trond Myklebust
2019-09-19 15:58   ` rsize,wsize=1M causes severe lags in 10/100 Mbps Alkis Georgopoulos
2019-09-19 16:11     ` Trond Myklebust
2019-09-19 19:21       ` Alkis Georgopoulos
2019-09-19 19:51         ` Trond Myklebust
2019-09-19 19:57           ` Alkis Georgopoulos
2019-09-19 20:05             ` Trond Myklebust
2019-09-19 20:20               ` Alkis Georgopoulos
2019-09-19 20:40                 ` Trond Myklebust
2019-09-19 21:19                   ` Daniel Forrest
2019-09-19 21:42                     ` Trond Myklebust
2019-09-19 22:16                       ` Daniel Forrest
2019-09-20  9:25                         ` Alkis Georgopoulos
2019-09-20  9:48                           ` Alkis Georgopoulos
2019-09-20 10:04                             ` Alkis Georgopoulos [this message]
2019-09-21  7:52                               ` Alkis Georgopoulos
2019-09-21  7:59                                 ` Alkis Georgopoulos
2019-09-21 11:02                                   ` Alkis Georgopoulos

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