diff options
Diffstat (limited to 'results/classifier/deepseek-2/reasoning/performance/1875762')
| -rw-r--r-- | results/classifier/deepseek-2/reasoning/performance/1875762 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2/reasoning/performance/1875762 b/results/classifier/deepseek-2/reasoning/performance/1875762 new file mode 100644 index 00000000..76c4ada8 --- /dev/null +++ b/results/classifier/deepseek-2/reasoning/performance/1875762 @@ -0,0 +1,19 @@ +<think> +Alright, so I have this bug report about QEMU with poor disk performance on sparse VMDKs. Let me try to figure out which category it falls into from the given options. + +First, the issue is related to disk performance when using sparse VMDK files. Sparse files are supposed to save space by only allocating blocks as needed. The user mentions that write speeds drop significantly—like from 1.5GB/s for fully allocated VMDKs down to a mere 10MB/s for sparse ones. That's a huge difference, so it's definitely a problem with performance. + +They also mention that adding "cache unsafe" improves the speed a lot, up to around 750MB/s. So this suggests something is wrong with how caching is handled by default in QEMU for these types of VMDKs. Caching can have a big impact on I/O performance because it affects whether data is written directly to disk or buffered. + +Looking at the command-line flags, they're using Virtio-SCSI and the scsi-hd device with the VMDK as hd0. So it's related to how QEMU handles storage devices, particularly when dealing with sparse images. + +Now, considering the categories provided: performance is one of them. The problem here is directly about disk write speeds being too slow under certain conditions (sparse VMDKs). It doesn't seem to be a mistranslation issue because that's more related to architecture mapping, which isn't mentioned here. Similarly, it's not about assembly lowering or other device-specific issues unless the device in question is peripheral. + +Wait, peripherals are another category. Since this is about disk performance with Virtio-SCSI and scsi-hd, maybe it's under peripherals? But the main issue is the performance aspect—how fast data is being written. So I think 'performance' is a more accurate category because that's what the bug report is primarily addressing. + +Alternatively, could it be related to caching in the hypervisor (like KVM)? The user points out that changing cache settings affects performance, so maybe it's under kernel or hypervisor? But no, the issue seems broader than just KVM. It's about how QEMU handles disk I/O with sparse images. + +So, considering all this, 'performance' is the most fitting category because the bug is about significant degradation in disk write speeds under specific conditions. The fact that using a different cache setting improves it suggests an underlying performance issue in QEMU's handling of sparse VMDKs. +</think> + +performance \ No newline at end of file |