Badari Pulavarty wrote:
> > ...
> > Until that's done you'll need to set BIO_MAX_PAGES to 16 in
> > include/linux/bio.h
> I am little confused here. I thought IPS driver can handle 64K IO.
> Infact, IPS_MAX_SG is set to 17. So it should be able to handle 68K.
> I have been told that it can handle more than that.. but for some
> reason it was set to 17.
> Paul, what kernel are u running ? 2.5.38 ?
Current bitkeeper has
#define BIO_MAX_PAGES (256)
That's a megabyte. It works fine with mpage.c. But direct-io.c
is still using BIO_MAX_PAGES. It really is building 1 megabyte
BIOs, which will break just about every device out there.
I think we just ask Linus to do the below until we get it fixed up?
--- 2.5.38-bk2/fs/direct-io.c~direct-io-size Mon Sep 23 16:12:25 2002
+++ 2.5.38-bk2-akpm/fs/direct-io.c Mon Sep 23 16:12:47 2002
@@ -26,7 +26,7 @@
* The largest-sized BIO which this code will assemble, in bytes. Set this
* to PAGE_SIZE if your drivers are broken.
-#define DIO_BIO_MAX_SIZE BIO_MAX_SIZE
+#define DIO_BIO_MAX_SIZE (16*1024)
* How many user pages to map in one call to get_user_pages(). This determines
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This archive was generated by hypermail 2b29 : Mon Sep 23 2002 - 22:00:41 EST