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Subject: RE: Cougar and Bobcat baseline performance testing with LSI 3992 SATA storage
Date: Thu, 22 May 2008 21:08:20 -0700
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E0A1C2512@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+8qrl4afCwBTQ3Yw
References: <BB375AF679D4A34E9CA8DFA650E2B04E0A0F8B8E@onstor-exch02.onstor.net>
From: "Brian Stark" <brian.stark@onstor.com>
To: "Fay Chong" <fay.chong@onstor.com>,
	"dl-Cougar" <dl-Cougar@onstor.com>
Cc: "dl-qualification" <dl-qualification@onstor.com>

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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
>=20
> 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:
>=20
> Cougar (R4.0 sub 22) =3D 145 MB/sec=20
> Bobcat (R3.3 sub 22) =3D 221 MB/sec=20
>=20
> One would have expected the Cougar to have greater bandwidth than the =
Bobcat. More investigation should be done.
>=20
> =
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Cougar-LSI3992pub.xl=
s
>=20
> =
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Bobcat2280-LSI3992pu=
b.xls
>=20
> =
\\Mightydog\users\fayc\public\WorkInProgress\LSI3992\Cougar-Bobcatpub.xls=

>=20
> Thanks
> Fay
>=20
>=20
>=20
> Fay Chong
> Sr. Performance Engineer
> ONStor, Inc.
> fay.chong@onstor.com
> 408.376.3130 (w)
>=20
>=20

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

<P><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></P>

<P><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></P>
<BR>

<P><FONT COLOR=3D"#0000FF" SIZE=3D2 FACE=3D"Arial">Brian</FONT>
</P>
<BR>
<UL>
<P><FONT SIZE=3D1 =
FACE=3D"Tahoma">_____________________________________________ </FONT>

<BR><B><FONT SIZE=3D1 FACE=3D"Tahoma">From: &nbsp;</FONT></B> <FONT =
SIZE=3D1 FACE=3D"Tahoma">Fay Chong&nbsp; </FONT>

<BR><B><FONT SIZE=3D1 FACE=3D"Tahoma">Sent:&nbsp;&nbsp;</FONT></B> <FONT =
SIZE=3D1 FACE=3D"Tahoma">Tuesday, May 20, 2008 7:40 PM</FONT>

<BR><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">To:&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B> <FONT SIZE=3D1 =
FACE=3D"Tahoma">dl-Cougar</FONT>

<BR><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">Cc:&nbsp;&nbsp;&nbsp;&nbsp;</FONT></B> <FONT SIZE=3D1 =
FACE=3D"Tahoma">dl-qualification</FONT>

<BR><B><FONT SIZE=3D1 =
FACE=3D"Tahoma">Subject:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT>=
</B> <FONT SIZE=3D1 FACE=3D"Tahoma">Cougar and Bobcat baseline =
performance testing with LSI 3992 SATA storage</FONT>
</P>

<P><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></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Cougar (R4.0 sub 22) =3D 145 MB/sec =
</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Bobcat (R3.3 sub 22) =3D 221 MB/sec =
</FONT>
</P>

<P><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>
</P>

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

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

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

<P><FONT SIZE=3D2 FACE=3D"Arial">Thanks</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Fay</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=3D2 FACE=3D"Arial">Fay Chong</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Sr. Performance Engineer</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">ONStor, Inc.</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">fay.chong@onstor.com</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">408.376.3130 (w)</FONT>
</P>
<BR>
</UL>
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