Re: Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
> > OK. I booted my test i386 machine with highmem=384m and did some tests. I > > also added a counter to st.c to count the highmem pages used for zero-copy > > DMA. I could not get dd to use highmem but with tar that succeeded. No > > extra messages were found in syslog during these tests. > > > > BUT, at the same time I remembered that the system in the Bugzilla report > > was Athlon64 running FC3 x86_64. The x86_64 kernel does not have highmem. > > True. I do have a machine running FC4 x86_64, but it doesn't have 4G of > memory, so it doesn't do the 4G-remap that the bug report refers to. > > Don't know if there is any way to make it do so (other than buy more memory). note that some (tyan) amd64 motherboards have a really broken bios wrt remap, and the only way to get those systems stable is to disable the memory remap in that bios. If you don't all kinds of funky stuff can and does happen. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
On 08/28/2005 06:40:04 AM, Kai Makisara wrote: On Fri, 26 Aug 2005, Kai Makisara wrote: > On Thu, 25 Aug 2005, Andrew Morton wrote: > > > Could this purely be a highmem problem? Is the zero-copy DMA feature of > > st.c known to work OK with x86 highmem? > > It is _not_ known _not_ to work ;-) I.e., I have received neither any > success nor any failure reports. I have not tested it because I don't have > any machine with enough memory (and I have not hacked a kernel to use > highmem with 512 MB of memory). I hope someone seeing this thread and > using highmem with tape can comment on this subject. > OK. I booted my test i386 machine with highmem=384m and did some tests. I also added a counter to st.c to count the highmem pages used for zero-copy DMA. I could not get dd to use highmem but with tar that succeeded. No extra messages were found in syslog during these tests. BUT, at the same time I remembered that the system in the Bugzilla report was Athlon64 running FC3 x86_64. The x86_64 kernel does not have highmem. True. I do have a machine running FC4 x86_64, but it doesn't have 4G of memory, so it doesn't do the 4G-remap that the bug report refers to. Don't know if there is any way to make it do so (other than buy more memory). Regards, Willem Riede. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
On Fri, 26 Aug 2005, Kai Makisara wrote: > On Thu, 25 Aug 2005, Andrew Morton wrote: > > > > > > > Begin forwarded message: > > > > Date: Tue, 23 Aug 2005 12:53:38 -0700 > > From: [EMAIL PROTECTED] > > To: [EMAIL PROTECTED] > > Subject: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives > > with 4G-remap > > > > > > http://bugzilla.kernel.org/show_bug.cgi?id=5117 > > > > Summary: Panic when accessing scsi-tapedrives with 4G-remap > > Kernel Version: 2.6.12.5 > > > > > > Could this purely be a highmem problem? Is the zero-copy DMA feature of > > st.c known to work OK with x86 highmem? > > It is _not_ known _not_ to work ;-) I.e., I have received neither any > success nor any failure reports. I have not tested it because I don't have > any machine with enough memory (and I have not hacked a kernel to use > highmem with 512 MB of memory). I hope someone seeing this thread and > using highmem with tape can comment on this subject. > OK. I booted my test i386 machine with highmem=384m and did some tests. I also added a counter to st.c to count the highmem pages used for zero-copy DMA. I could not get dd to use highmem but with tar that succeeded. No extra messages were found in syslog during these tests. BUT, at the same time I remembered that the system in the Bugzilla report was Athlon64 running FC3 x86_64. The x86_64 kernel does not have highmem. -- Kai - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
On Thu, 25 Aug 2005, Andrew Morton wrote: > > > Begin forwarded message: > > Date: Tue, 23 Aug 2005 12:53:38 -0700 > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > Subject: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives > with 4G-remap > > > http://bugzilla.kernel.org/show_bug.cgi?id=5117 > > Summary: Panic when accessing scsi-tapedrives with 4G-remap > Kernel Version: 2.6.12.5 > > > Could this purely be a highmem problem? Is the zero-copy DMA feature of > st.c known to work OK with x86 highmem? It is _not_ known _not_ to work ;-) I.e., I have received neither any success nor any failure reports. I have not tested it because I don't have any machine with enough memory (and I have not hacked a kernel to use highmem with 512 MB of memory). I hope someone seeing this thread and using highmem with tape can comment on this subject. -- Kai - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
On 08/25/2005 08:24:17 PM, Andrew Morton wrote: Subject: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap http://bugzilla.kernel.org/show_bug.cgi?id=5117 Summary: Panic when accessing scsi-tapedrives with 4G-remap Kernel Version: 2.6.12.5 Could this purely be a highmem problem? Is the zero-copy DMA feature of st.c known to work OK with x86 highmem? I don't know about Kai, but I don't have the hardware to test that... Sorry, Willem Riede. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Fw: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap
Begin forwarded message: Date: Tue, 23 Aug 2005 12:53:38 -0700 From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [Bugme-new] [Bug 5117] New: Panic when accessing scsi-tapedrives with 4G-remap http://bugzilla.kernel.org/show_bug.cgi?id=5117 Summary: Panic when accessing scsi-tapedrives with 4G-remap Kernel Version: 2.6.12.5 Could this purely be a highmem problem? Is the zero-copy DMA feature of st.c known to work OK with x86 highmem? - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
