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Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation
From: |
Hannes Reinecke |
Subject: |
Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation |
Date: |
Sat, 02 Jul 2011 15:50:13 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110414 SUSE/3.1.10 Thunderbird/3.1.10 |
On 07/01/2011 06:42 PM, Alexander Graf wrote:
On 01.07.2011, at 17:35, Hannes Reinecke wrote:
This patch adds an emulation for the LSI Megaraid SAS 8708EM2 HBA.
Have you tried to execute the current version of megasas and actually
> do something with it? I just booted up openSUSE 11.4 rescue from DVD
> with a megasas adapter that contained a raw file backed by tmpfs.
> Creating a partition worked fine, but when running mkfs.ext3 and
> mounting afterwards, the mount fails saying there is no ext3 on the disk.
Sounds like data corruption to me :). I know that this used to work
> a while back, so it might be a regression recently?
It worked here, in the sense that I've booted up an existing openSUSE
11.4 installation. But I wouldn't be surprised if the degradation to use
bounce-buffers has some flaws.
My guess here is that we have problems when the transfersizes larger as
the internal bounce buffer.
(I probably should be putting in some more references to 'bounce
buffers' here to alert people that using bounce buffers in SCSI is the
best way of killing performance)
(And no, I will not getting into another dog-fight with Paul B. here.
Virtio can do without bounce buffers. AHCI can. So I fail to see why
SCSI has to rely on bounce buffers.)
But enough of this, Yeah, bugfixing is needed here. I see what I can do.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
address@hidden +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
- [Qemu-devel] [PATCH 0/3] [v5] Megasas HBA Emulation, Hannes Reinecke, 2011/07/01
- [Qemu-devel] [PATCH 1/3] iov: Update parameter usage in iov_(to|from)_buf(), Hannes Reinecke, 2011/07/01
- [Qemu-devel] [PATCH 2/3] scsi: Add 'hba_private' to SCSIRequest, Hannes Reinecke, 2011/07/01
- [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Hannes Reinecke, 2011/07/01
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Alexander Graf, 2011/07/01
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation,
Hannes Reinecke <=
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Alexander Graf, 2011/07/02
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Paolo Bonzini, 2011/07/03
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Hannes Reinecke, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Paolo Bonzini, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Hannes Reinecke, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Paolo Bonzini, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Hannes Reinecke, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Paolo Bonzini, 2011/07/04
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Stefan Hajnoczi, 2011/07/02
- Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation, Hannes Reinecke, 2011/07/04