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Subject: RE: Cougar and Bobcat baseline performance testing with LSI 3992 SATA storage
Date: Fri, 23 May 2008 09:15:24 -0700
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E0A1C2694@onstor-exch02.onstor.net>
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Thread-Topic: Cougar and Bobcat baseline performance testing with LSI 3992 SATA storage
Thread-Index: Aci66/jGYRoDe3BDSTKu+8qrl4afCwBTQ3YwAC3ElDA=
References: <BB375AF679D4A34E9CA8DFA650E2B04E0A0F8B8E@onstor-exch02.onstor.net> <BB375AF679D4A34E9CA8DFA650E2B04E0A1C2512@onstor-exch02.onstor.net>
From: "Maxim Kozlovsky" <maxim.kozlovsky@onstor.com>
To: "Brian Stark" <brian.stark@onstor.com>,
	"Fay Chong" <fay.chong@onstor.com>,
	"dl-Cougar" <dl-Cougar@onstor.com>
Cc: "dl-qualification" <dl-qualification@onstor.com>

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It is because of software checksums. Ncpu is out of cpu.

_____________________________________________
From: Brian Stark=20
Sent: Thursday, May 22, 2008 9:08 PM
To: Fay Chong; dl-Cougar
Cc: dl-qualification
Subject: RE: Cougar and Bobcat baseline performance testing with LSI =
3992 SATA storage

We've shown with nfspertest that the bandwidth inside the box is much =
higher than Bobcat, but this doesn't take into account bandwidth over =
the GigE links.  The only explanation that I can think of for the =
difference is that Cougar is currently doing TCP checksums in software, =
which is causing the slowdown in performance relative to Bobcat.  We =
didn't see a bottleneck doing the software checksums when running SPEC, =
but it's possible that streaming workloads are affected.

Can we get a profile on the TXRX when running this test?  This would =
then show if the processor is spending a lot of time in the checksum =
code.


Brian


	_____________________________________________=20
	From: 	Fay Chong =20
	Sent:	Tuesday, May 20, 2008 7:40 PM
	To:	dl-Cougar
	Cc:	dl-qualification
	Subject:	Cougar and Bobcat baseline performance testing with LSI 3992 =
SATA storage

	Here are the results of Cougar and Bobcat baseline testing with LSI =
3992 SATA storage. The Cougar was slightly better in sequential writes =
but worse in sequential reads. Random reads and writes were about the =
same. A front end FP bandwidth test was performed. This test uses =
iometer with =BD GB files on 4 raid groups. Sequential reads were =
executed (32k). It was expected that the entire files would be in the =
filer cache so this should be a measure of front end read bandwidth. =
Here are the results:

	Cougar (R4.0 sub 22) =3D 145 MB/sec=20
	Bobcat (R3.3 sub 22) =3D 221 MB/sec=20

	One would have expected the Cougar to have greater bandwidth than the =
Bobcat. More investigation should be done.

	=
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Cougar-LSI3992pub.xl=
s

	=
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Bobcat2280-LSI3992pu=
b.xls

	=
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Cougar-Bobcatpub.xls=


	Thanks
	Fay



	Fay Chong
	Sr. Performance Engineer
	ONStor, Inc.
	fay.chong@onstor.com
	408.376.3130 (w)

=09

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<TITLE>RE: Cougar and Bobcat baseline performance testing with LSI 3992 =
SATA storage</TITLE>
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<!-- Converted from text/rtf format -->

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">It is because of software =
checksums. Ncpu</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> <FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">is out =
of cpu.</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 =
FACE=3D"Tahoma">_____________________________________________<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">From:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Brian Stark<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Sent:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Thursday, May 22, 2008 =
9:08 PM<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">To:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Fay Chong; dl-Cougar<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Cc:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> dl-qualification<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Subject:</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma"> RE: Cougar and Bobcat baseline performance testing with =
LSI 3992 SATA storage</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">We've shown with nfspertest =
that the bandwidth inside the box is much higher than Bobcat, but this =
doesn't take into account bandwidth over the GigE links.&nbsp; The only =
explanation that I can think of for the difference is that Cougar is =
currently doing TCP checksums in software, which is causing the slowdown =
in performance relative to Bobcat.&nbsp; We didn't see a bottleneck =
doing the software checksums when running SPEC, but it's possible that =
streaming workloads are affected.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">Can we get a profile on the TXRX when running this =
test?&nbsp; This would then show if the processor is spending a lot of =
time in the checksum code.</FONT></SPAN></P>
<BR>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">Brian</FONT></SPAN></P>
<BR>
<UL DIR=3DLTR>
<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D1 FACE=3D"Tahoma">_____________________________________________ =
</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D1 FACE=3D"Tahoma">From: =
&nbsp;</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D1 FACE=3D"Tahoma">Fay Chong&nbsp; =
</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">Sent:&nbsp;&nbsp;</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D1 =
FACE=3D"Tahoma">Tuesday, May 20, 2008 7:40 PM</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">To:&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D1 =
FACE=3D"Tahoma">dl-Cougar</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">Cc:&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D1 =
FACE=3D"Tahoma">dl-qualification</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">Subject:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>=
</B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D1 FACE=3D"Tahoma">Cougar and Bobcat baseline performance testing =
with LSI 3992 SATA storage</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Arial">Here are the results of Cougar and Bobcat =
baseline testing with LSI 3992 SATA storage. The Cougar was slightly =
better in sequential writes but worse in sequential reads. Random reads =
and writes were about the same. A front end FP bandwidth test was =
performed. This test uses iometer with =BD GB files on 4 raid groups. =
Sequential reads were executed (32k). It was expected that the entire =
files would be in the filer cache so this should be a measure of front =
end read bandwidth. Here are the results:</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Cougar =
(R4.0 sub 22) =3D 145 MB/sec </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Bobcat =
(R3.3 sub 22) =3D 221 MB/sec </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">One =
would have expected the Cougar to have greater bandwidth than the =
Bobcat. More investigation should be done.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><A =
HREF=3D"file://\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Couga=
r-LSI3992pub.xls"><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><U><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Couga=
r-LSI3992pub.xls</FONT></U></SPAN><SPAN LANG=3D"en-us"></SPAN></A><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><A =
HREF=3D"file://\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Bobca=
t2280-LSI3992pub.xls"><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><U><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Bobca=
t2280-LSI3992pub.xls</FONT></U></SPAN><SPAN =
LANG=3D"en-us"></SPAN></A><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><A =
HREF=3D"file://\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Couga=
r-Bobcatpub.xls"><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><U><FONT COLOR=3D"#0000FF" SIZE=3D2 =
FACE=3D"Arial">\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Couga=
r-Bobcatpub.xls</FONT></U></SPAN><SPAN LANG=3D"en-us"></SPAN></A><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Thanks</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Fay</FONT></SPAN></P>
<BR>
<BR>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Fay =
Chong</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">Sr. =
Performance Engineer</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">ONStor, =
Inc.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">fay.chong@onstor.com</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">408.376.3130 (w)</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN></P>
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