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<TITLE>sane-devel: Re: Problems with KYE ColorPage-HR5+DTC3181LE+Kerne</TITLE>
<META NAME="Author" CONTENT="Douglas Gilbert (dgilbert@interlog.com)">
<META NAME="Subject" CONTENT="Re: Problems with KYE ColorPage-HR5+DTC3181LE+Kernel 2.4.0">
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<H1>Re: Problems with KYE ColorPage-HR5+DTC3181LE+Kernel 2.4.0</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20Problems%20with%20KYE%20ColorPage-HR5%2BDTC3181LE%2BKernel%202.4.0&In-Reply-To=&lt;3A7C1752.805824AC@interlog.com&gt;"><EM>dgilbert@interlog.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Sat Feb 03 2001 - 06:36:02 PST
<P>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0018.html">Oliver Rauch: "Re: Problems with KYE ColorPage-HR5+DTC3181LE+Kernel 2.4.0"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0017.html">Patricio Díaz G.: "RE: Problems with KYE ColorPage-HR5+DTC3181LE+Kernel 2.4.0"</A>
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<P>
Oliver Rauch wrote:
<BR>
<EM>&gt;
</EM><BR>
<EM>&gt; &gt; &quot;Patricio Díaz G.&quot; wrote:
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; Abel,
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; The problem remains, attached I send you the log files generated with the new version you sent to me (thanks for that).
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; Today I played a lot with the sources, and the exact line where the program freezes is:
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; sanei_scsi.c (1972): select (req-&gt;fd, &amp;readable, 0, 0, 0);
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; I want to learn about the commands to send to the scanner, do you have some information?, so I could help to fix this problem.
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; thanks,
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt;
</EM><BR>
<EM>&gt; &gt; Patricio
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Hi,
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; is it possible, that the sanei_scsi_open_extended does not
</EM><BR>
<EM>&gt; work correct ?:
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; [sanei_scsi] sanei_scsi_open_extended: using 456704 bytes as SCSI buffer
</EM><BR>
<EM>&gt; ...
</EM><BR>
<EM>&gt; [umax] sane_start: sanei_scsi_open_extended returned scsi buffer size = 456704
</EM><BR>
<EM>&gt; ...
</EM><BR>
<EM>&gt; [sanei_scsi] scsi_req_enter: entered 0x8050cf0
</EM><BR>
<EM>&gt; [sanei_scsi] sanei_scsi.issue: 0x8050cf0
</EM><BR>
<EM>&gt; dev_max(currently)=7 max_active_device=1 (origin 1)
</EM><BR>
<EM>&gt; scsi_dma_free_sectors=48 sg_pool_secs_aval=320 def_reserved_size=32768
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; (Is def_reserved_size=32768 the real buffer size?)
</EM><BR>
<P>Oliver,
<BR>
Things are probably ok. I suspect Abel is using
<BR>
system(&quot;cat /proc/scsi/sg/debug&quot;) inside sanei to output
<BR>
sg's internal state. Here is the output from that command
<BR>
on my machine when I'm reading a disk via sg:
<BR>
<P>$ cat /proc/scsi/sg/debug
<BR>
dev_max(currently)=9 max_active_device=3 (origin 1)
<BR>
&nbsp;scsi_dma_free_sectors=512 sg_pool_secs_aval=320 def_reserved_size=32768
<BR>
<EM> &gt;&gt;&gt; device=sg0 scsi1 chan=0 id=1 lun=0 em=0 sg_tablesize=255 excl=0
</EM><BR>
&nbsp;&nbsp;&nbsp;FD(1): timeout=60000ms bufflen=65536 (res)sgat=2 low_dma=0
<BR>
&nbsp;&nbsp;&nbsp;cmd_q=1 f_packid=0 k_orphan=0 closed=0
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;rb&gt;&gt; act: id=191488 blen=65536 t_o/elap=40000/10ms sgat=2 op=0x28
<BR>
<P>The 'def_reserved_size=32768' is inherited by all sg file
<BR>
descriptors (fds) when they are open()ed. The 'bufflen=65536'
<BR>
on FD(1) indicates that the SG_SET_RESERVED_SIZE ioctl
<BR>
must have been called to increase the inherited value.
<BR>
The command that is active has set its data length to
<BR>
'blen=65536' and the &quot;rb &gt;&gt; &quot; indicates the reserved
<BR>
buffer for that fd is being used.
<BR>
<P>Perhaps this is information overload but it tells me
<BR>
quite a lot.
<BR>
<P>The use of the reserved buffer is not essential (i.e.
<BR>
the command data length may exceed the reserved buffer
<BR>
size). It just removes a small chance of receiving an
<BR>
ENOMEM error. [With more memory and less ISA cards
<BR>
around, the small chance is getting smaller.]
<BR>
<P>Doug Gilbert
<BR>
<P><PRE>
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