[PATCH] aacraid: Fix for controller load based timeouts
Martin Drab found that he could get aacraid timeouts with high load on his controller / disk drive combinations. After some experimentation Mark Salyzyn has come up with a patch to reduce the default max_sectors to something that will keep the controller from being overloaded and will eliminate the timeout issues. Signed-off-by: Mark Haverkamp <markh@osdl.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by: Mark Salyzyn <mark_salyzyn@adaptec.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -15,11 +15,7 @@
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#define AAC_MAX_LUN (8)
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#define AAC_MAX_HOSTPHYSMEMPAGES (0xfffff)
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/*
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* max_sectors is an unsigned short, otherwise limit is 0x100000000 / 512
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* Linux has starvation problems if we permit larger than 4MB I/O ...
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*/
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#define AAC_MAX_32BIT_SGBCOUNT ((unsigned short)8192)
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#define AAC_MAX_32BIT_SGBCOUNT ((unsigned short)512)
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/*
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* These macros convert from physical channels to virtual channels
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@ -374,7 +374,8 @@ static int aac_slave_configure(struct scsi_device *sdev)
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else
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scsi_adjust_queue_depth(sdev, 0, 1);
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if (host->max_sectors < AAC_MAX_32BIT_SGBCOUNT)
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if (!(((struct aac_dev *)host->hostdata)->adapter_info.options
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& AAC_OPT_NEW_COMM))
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blk_queue_max_segment_size(sdev->request_queue, 65536);
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return 0;
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