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<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>We
currently don't have such an option.</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>From
my observation on my machines it seems that eth buffers always seem to start
with xxxxA</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>for
example:</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial>eth.pkt starts at 0xFFFFFA800DD5F38A<BR>eth.pkt starts at
0xFFFFFA800DD6042A<BR>eth.pkt starts at 0xFFFFFA800DD614CA<BR>eth.pkt starts at
0xFFFFFA800DD6256A<BR>eth.pkt starts at 0xFFFFFA800DD6360A<BR>eth.pkt starts at
0xFFFFFA800DD646AA<BR>eth.pkt starts at 0xFFFFFA800DD6574A<BR>eth.pkt starts at
0xFFFFFA800DD667EA<BR></FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>(this
was printed with the line " cl_dbg_out("eth.pkt starts at
0x%p\n", &p_desc->buf.eth.pkt);")</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial> </DIV></FONT></SPAN>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>Since
the eth header starts 14 bytes later it will always start on 0xa+0xE =
0x18.</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>In
other words the addresses on "my machine" are always aligned to a 64 bits
boundary (that is take the 8 from the 0x18 and multiply it with 8) which is
probably right.</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>Still,
if you want to be sure that buffers are always aligned well, you probably need
to allocate bigger buffers and use whatever part from them.</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2 face=Arial>Here
is some more technical data:</FONT></SPAN></DIV>
<DIV><SPAN class=107094509-19012010><FONT color=#0000ff size=2
face=Arial></FONT></SPAN> </DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>allocation is being done at the function
__buf_mgr_init()</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010></SPAN><SPAN class=107094509-19012010>on the line
" 0, 0, sizeof(ipoib_recv_desc_t), __recv_ctor, NULL, p_port
);"</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>you can increase the size that is allocated there, and
on the function </SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>__recv_ctor you can change the
line </SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010> p_desc =
(ipoib_recv_desc_t*)p_object;</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>to align to where ever you
want.</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>Thanks</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><FONT color=#0000ff><SPAN
class=107094509-19012010>Tzachi</DIV>
<DIV><BR><BR></DIV></SPAN></FONT></FONT></FONT><BR>
<BLOCKQUOTE
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<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> ofw-bounces@lists.openfabrics.org
[mailto:ofw-bounces@lists.openfabrics.org] <B>On Behalf Of </B>John
Russo<BR><B>Sent:</B> Monday, January 18, 2010 8:40 PM<BR><B>To:</B>
ofw@lists.openfabrics.org<BR><B>Subject:</B> [ofw] Buffer alignment in
IPoIB<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>We have found that in IPoIB, packets that were handed over
from IPoIB had their buffer addresses misaligned. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>In OFED there is an option to align buffers. Do we have
that same option in the WinOF version?.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><IMG id=Picture_x0020_1 alt="Signiture QL blu"
src="cid:107094509@19012010-132D" width=44 height=26><o:p></o:p></P>
<P class=MsoNormal>John F. Russo<o:p></o:p></P>
<P class=MsoNormal>Engineering Manager<o:p></o:p></P>
<P class=MsoNormal>QLogic Corporation<o:p></o:p></P>
<P class=MsoNormal>780 Fifth Avenue<o:p></o:p></P>
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<P class=MsoNormal>Direct: 610-233-4866<o:p></o:p></P>
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610-233-4777<o:p></o:p></P>
<P class=MsoNormal>Cell: 610-246-9903<o:p></o:p></P>
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