From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: linux-kernel@vger.kernel.org
Cc: linux-net@vger.kernel.org, Alan Piszcz <ap@solarrain.com>
Subject: Only ~85MiB/s (e1000e/write) to ~310MiB/s RAID-0 on ATOM board?
Date: Fri, 7 Jan 2011 15:18:51 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.00.1101071506480.10997@p34.internal.lan> (raw)
Hi,
Motherboard: Supermicro X7SPA-HF (MINI-ITX)
I tried changing various settings with ethtool, ifconfig, and e1000e
module parameters.
=> I get ~310MiB/s write with 5 Raptor 150s in RAID-0
atom166:/r1# dd if=/dev/zero of=bigfile bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 34.7194 s, 309 MB/s
atom166:/r1#
=> I get 239MiB/s read with 5 Raptor 150s in RAID-0
# dd if=bigfile of=/dev/null bs=1M count=10240
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB) copied, 44.9199 s, 239 MB/s
When I use samba to push files to this RAID I only get between 80-90MiB/s
instead of the usual 100-120MiB/s I see between my main (ATX) boards.. It
seems to hover around 85MiB/s average..
I also tried an external PCI-e 1.0 Intel NIC, made no difference. From
the NM10 chipset block diagram, there should be enough bandwidth to fully
saturate a gigabit link, is the CPU (Dual core Atom D510) too slow to
achieve the maximum speed?
FTP is slightly faster:
`20101030-t500.tib' at 400541736 (3%) 88.72M/s eta:2m [Receiving data]
`20101030-t500.tib' at 565772280 (4%) 91.51M/s eta:2m [Receiving data]
`20101030-t500.tib' at 982224624 (7%) 94.75M/s eta:2m [Receiving data]
`20101030-t500.tib' at 1967568384 (15%) 96.39M/s eta:2m [Receiving data]
`20101030-t500.tib' at 2299966640 (17%) 96.90M/s eta:2m [Receiving data]
Getting the same file to an ATX motherboard:
`20101030-t500.tib' at 1020865896 (7%) 106.13M/s eta:2m [Receiving data]
`20101030-t500.tib' at 1394552704 (10%) 107.53M/s eta:2m [Receiving data]
`20101030-t500.tib' at 1861689088 (14%) 108.49M/s eta:97s [Receiving data]
`20101030-t500.tib' at 2702497824 (21%) 109.56M/s eta:88s [Receiving data]
`20101030-t500.tib' at 3636710872 (28%) 110.27M/s eta:80s [Receiving data]
Why cannot I achieve the last 10-20MiB/s in performance on the Atom board?
Also, the other direction (READ) I get 105-110MiB/s:
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 0 37260 328 3888560 0 0 3187 6746 2295 309 1 13 84 1
0 0 0 36632 328 3890492 0 0 105184 0 23332 4924 3 21 75 0
0 0 0 35516 328 3893688 0 0 105616 0 23567 5143 3 22 75 0
1 0 0 35888 328 3894428 0 0 106404 0 23247 5167 3 21 76 0
0 0 0 35392 328 3897068 0 0 106472 0 23351 5221 3 21 76 0
What is causing the bottleneck for write?
Justin.
next reply other threads:[~2011-01-07 20:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-07 20:18 Justin Piszcz [this message]
2011-01-16 18:49 ` Ian E. Morgan
2011-01-16 19:08 ` Justin Piszcz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.00.1101071506480.10997@p34.internal.lan \
--to=jpiszcz@lucidpixels.com \
--cc=ap@solarrain.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-net@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®